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Home » Blog » Appetizer and Snack Recipes » French Onion Tart

French Onion Tart

Cathy Roma Published: Dec 7, 2022

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A tender pastry crust topped with sweet roasted onions and just a hint of herbs make this French onion tart a party favorite. A sprinkle of thyme and a handful of gruyere pair deliciously with caramelized onions.
A tender pastry crust topped with sweet roasted onions and just a hint of herbs make this French onion tart a party favorite. A sprinkle of thyme and a handful of gruyere pair deliciously with caramelized onions.
French Onion Tart

Okay, so when you think party food I’m guessing your first thought isn’t onions. Right? That was until now.

See this French onion tart is absolutely party-worthy and I promise that it will be the first thing that disappears at your next get-together.

I love to entertain around the holidays. Small groups, big parties…it just doesn’t feel like Christmas without a fair amount of cooking and a specialty cocktail or two. We’re not throwing a big holiday party this year, but that doesn’t mean we won’t have a few small ones.

French Onion Tart

One thing most of our parties have in common is plenty of food (or maybe too much if I’m being honest), plenty to drink and some good music. And unless I’m hosting a dinner party, another common factor is serving food that can be easily picked up and eaten.

That means no utensils if I can help it, appetizer plates only, and crafting a menu that can be enjoyed with just a napkin in hand.

Serving finger food not only keeps the dishes to a minimum and streamlines clean up, it also keeps the party moving.

Guests aren’t trying to slice through a piece of chicken while balancing a plate on their lap with a drink in hand. Instead, they’re mingling, nibbling, chatting and, depending on the hour and cocktail consumption, dancing.

If you want more tips for party planning, be sure to sign up for my newsletter and receive my guide 10 Steps to a Stress-free Soiree! 

French Onion Tart

Onions also have a special place in my heart around the holidays because growing up my dad always made his “famous” onion pizza on Christmas Eve. And let me tell you, it was truly famous with my family and friends.

Every year my dad cooked up a big pot of tomato sauce filled with tons of onions and black olives and let it simmer for hours on the stove. Then he rolled out a large pizza dough, covered it with the sauce and topped it with another dough.

It was baked until golden brown perfection and gobbled up by all of the guests that passed through our doors on Christmas Eve. And in the spirit of over-feeding, it was of course one of the many pizzas he would make that day.

While an often requested family favorite, onion pizza only came around once a year, much like a Shamrock Shake or candy corn. But it’s no wonder, as it was pretty labor intensive and time consuming.

But unlike the onion pizza of my youth, today’s onion tart recipe requires minimum effort while still delivering big flavor.

Let’s make a French Onion Tart

  1. Roll the dough into a 10 x 14 inch rectangle and trim the edges. Lay on a parchment lined sheet tray.
  2. Sprinkle with shredded cheese.
  3. Top with fresh herbs.
  1. Arrange the half moons in a diagonal, overlapping pattern. Brush with heavy cream.
  2. Dot with butter and sprinkle with salt.
  3. Bake until tart is golden brown and onions are fully cooked. Slice and serve.

Tips for success

  • The dough comes together in minutes in your food processor and can be made well in advance and frozen until you’re ready to use it.
  • There’s no pre-cooking of the onions on the stove like many onion tarts require. They’re simply sliced thin and arranged over a sprinkling of grated cheese and herbs and baked until golden brown and caramelized.
  • The tart can be sliced into squares, strips, or wedges, but no matter how you slice it (yes I went there), it’s just plain delicious.
  • Tart can be served right out of the oven or at room temperature, which makes it ideal for parties.
French Onion Tart

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3.65 from 156 votes
French Onion Tart cut into square slices, golden brown, and scattered with thyme sprigs.
Print
French Onion Tart
Prep Time
30 mins
Cook Time
40 mins
Resting Time
1 hr
Total Time
1 hr 10 mins
 
A tender pastry crust topped with sweet roasted onions and just a hint of herbs make this a onion tart a party favorite.

Course: Appetizer
Cuisine: French
Keyword: french onion tart, onion tart
Servings: 8 servings
Calories: 345 kcal
Author: Cathy Roma | What Should I Make For…
Ingredients
Pastry
  • 2 cups all purpose flour
  • 1/2 tsp kosher salt
  • 1 Tbsp sugar
  • 12 Tbsp cold unsalted butter, diced (1 1/2 sticks)
  • 1/2 cup ice water
Onion Topping
  • 1 cup gruyere cheese, shredded (4 oz)
  • 1 1/2 tsp fresh thyme, minced
  • 2 tsp fresh chives, minced
  • 1 1/4 lbs sweet onions, (about 3 medium onions)
  • 1 Tbsp heavy cream
  • 3 Tbsp unsalted butter, diced
  • 1 tsp kosher salt
Instructions
Pastry
  1. Place the flour, salt, and sugar in the bowl of a food processor fitted with the steel blade. Pulse for a few seconds to combine.

  2. Add the butter and pulse 10 to 12 times, until the butter is in small bits the size of peas.
  3. With the motor running, pour the ice water down the feed tube and pulse just until the dough starts to come together. Dump onto a floured board and knead quickly into a ball. Wrap in plastic and refrigerate for at least 1 hour.
Prepare the tart
  1. Preheat the oven to 400 degrees and line a sheet pan with parchment paper.

  2. Roll the dough between two sheets of lightly floured wax paper, slightly larger than 10 x 14 inches. Using a ruler and a small knife, trim the edges. Place the dough on the prepared sheet pan and refrigerate while you prepare the onions.
  3. Sprinkle the rolled pastry with the cheese right to the edges.
  4. Sprinkle with thyme and chives.
  5. Peel, halve, and very thinly slice the onions into half moons, keeping the moons intact. Place the onion half moons on the pastry in diagonal lines, just barely overlapping and brush lightly with cream.

  6. Dot with the butter and sprinkle with salt.
  7. Bake for 40 mins or until the tart is golden and browned. Cover the edges with foil if the tart is getting too brown during baking.
  8. Let cool slightly and cut into squares to serve. Serve warm or at room temperature.
Recipe Notes
  • The dough comes together in minutes in your food processor and can be made well in advance and frozen until you’re ready to use it.
  • There’s no pre-cooking of the onions on the stove like many onion tarts require. They’re simply sliced thin and arranged over a sprinkling of grated cheese and herbs and baked until golden brown and caramelized.
  • The tart can be sliced into squares, strips, or wedges, but no matter how you slice it (yes I went there), it’s just plain delicious.
  • Tart can be served right out of the oven or at room temperature, which makes it ideal for parties.

*Adapted from The Barefoot Constessa’s French Apple Tart

Nutrition Facts
French Onion Tart
Amount Per Serving
Calories 345 Calories from Fat 198
% Daily Value*
Fat 22g34%
Saturated Fat 14g88%
Cholesterol 59mg20%
Sodium 443mg19%
Potassium 142mg4%
Carbohydrates 32g11%
Fiber 2g8%
Sugar 4g4%
Protein 4g8%
Vitamin A 710IU14%
Vitamin C 5.6mg7%
Calcium 27mg3%
Iron 1.6mg9%
* Percent Daily Values are based on a 2000 calorie diet.

Update Notes: This post was originally published in November 2016 but was republished with step by step photos and tips in December 2018.

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Appetizer and Snack Recipes, Holiday Recipes, Recipe Vidalia, onion, party, snack, starter, tart, appetizer, Thanksgiving, Breakfast, vegetarian, brunch, veggies, Christmas, flatbread, Hanukkah, herbs, holiday

About Cathy Roma

My food philosophy is simple: everything in moderation. Sweet, savory, healthy, decadent…food, like life, is all about balance. I rely on my background as a trained chef/mom to create family-friendly recipes that will inspire you to cook, not complicate your life.

★ Made this recipe? Make sure to give it a rating below!

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Reader Interactions

Comments

  1. Mary Ann | The Beach House Kitchen says

    November 29, 2016 at 1:36 pm

    This would have to come around way more than once at year at our house!! This tart looks absolutely amazing Cathy. I love how you don’t even need to cook the onions ahead of time. Thanks for sharing this holiday favorite!

    Reply
    • Cathy says

      December 7, 2016 at 7:41 pm

      Thanks Mary Ann. And you’re right…this needs to go into the regular rotation!

  2. Jennifer @ Seasons and Suppers says

    November 29, 2016 at 2:28 pm

    Wow! I could stare at this all day 🙂 Beautiful and such great flavours. Perfect for the holidays.

    Reply
    • Cathy says

      December 7, 2016 at 7:42 pm

      Thanks Jennifer! It’s a great holiday app.

  3. Karen @ Seasonal Cravings says

    November 29, 2016 at 2:34 pm

    This would be perfect for my holiday party with the ladies! Can’t wait to try it out!

    Reply
    • Cathy says

      December 7, 2016 at 7:42 pm

      Let me know if you give it a go Karen!

  4. Cindy says

    November 29, 2016 at 5:23 pm

    This look so lovely. All my faves! Love the memory of your dad – thanks for sharing.

    Reply
    • Cathy says

      November 30, 2016 at 12:41 am

      Thanks Cindy! The onion pizza is almost as good as the memories that go with it!

  5. annie@ciaochowbambina says

    December 1, 2016 at 2:19 pm

    5 stars
    I’m a huge onion fan too! The longer they cook the sweeter they get and I am all about it! I loved the memory of your dad….my dad would make fried dough and we’d have Shirley Temples every Christmas Eve.

    Reply
    • Cathy says

      December 7, 2016 at 7:43 pm

      OH FRIED DOUGH!! That was Christmas breakfast Annie!! The best!!

  6. Rachel says

    September 26, 2017 at 2:06 am

    I can’t quit making this.
    ❤️

    Reply
    • Cathy says

      September 26, 2017 at 3:11 am

      I love it! Never quit!!

  7. Alyse Wittenberg says

    November 4, 2017 at 3:37 am

    5 stars
    I have made this tart three times and it’s always great. I do drop the oven temp 15 degrees and set it for convection towards the end of the baking time to brown up the onions. Otherwise I follow the directions to the letter. Lots of ooohs and aaahs when I show up with it for parties. A total crowd pleaser.

    Reply
    • Cathy says

      November 5, 2017 at 9:17 pm

      So glad you enjoyed the tart Alyse and great tip to adjust the heat to get the onions browned to your liking. This is always a favorite in my house around the holidays too.

  8. Emma says

    April 7, 2018 at 9:08 pm

    This recipe looks amazing and I’m keen to make it for a party.. I’m trying to make as much of the food as possible in advance and I’m then freezing it all so I was wondering if this tart can be frozen once cooked?
    Thanks

    Reply
    • Cathy says

      April 12, 2018 at 5:34 pm

      I’ve never baked it and frozen it so I hesitate to recommend that. You can make the dough and roll it out and freeze that on a cookie sheet and then finish it day of.

  9. Jan Jones says

    May 4, 2018 at 10:41 am

    This recipe sounds absolutely amazing! I am planning on making it, then immediately adding it to my handwritten cookbook of favorite recipes. While the gruyere cheese sounds wonderful, I hope to be able to make it with other varieties of cheeses that I keep on hand so as to use it as one of those recipes you can make and take at the last minute without a trip to the grocery store. Thank you so much for sharing your recipe, and your family memories!

    Reply
    • Cathy says

      May 8, 2018 at 7:36 pm

      You can absolutely use any cheese you have on hand…most of your favorites should work well. I hope you enjoy the tart Jan, it’s hands down one of my personal favorites and a staple in our home.

  10. Shane Boulds says

    June 20, 2018 at 9:53 pm

    wondering if you have ever tried this with Pizza dough (that you can get from the store or your pizza place).

    Carmalized Onions are one of my favorite flavors ever… can’t wait to make this… if I try the pizza dough I’ll let you know.

    Reply
    • Cathy says

      July 3, 2018 at 2:18 pm

      I haven’t because I have a special place in my heart (and stomach) for this flakey pastry crust, but I have no doubt that pizza dough would work. It would simply be more of an onion pizza and less of a tart. Let me know if you give it a go!

    • Calamity Dawn says

      September 6, 2021 at 1:35 am

      I just made it with Pillsbury Pizza Dough and it was AWESOME! I had some figs on hand (fig season around here is crazy) so I cut up about 8 into quarters and dotted them on top. Everyone loved it! I’m making this again soon for sure!

  11. Lara says

    July 3, 2018 at 12:09 am

    I’m with Shane & thinking pizza crust, because I’ve never cared for pie crust. Looks wonderful, wondering what size sheet tray you used, I have standard 1/2 sheet pans which are 13×18, so quite a bit bigger than the 10×14 you mention.

    Reply
    • Cathy says

      July 3, 2018 at 2:26 pm

      Definitely give pizza dough a try if you’re not a fan of a pastry crust. My dad always used pizza dough for his onion pizza so I know it will work. I always use a standard half sheet pan, the dough doesn’t have to extend to the sides. You can play around with the dimensions if you use pizza dough. Hope you enjoy!

  12. Kim says

    December 25, 2018 at 5:51 am

    Has any one tried puff pasty dough with this? I was thinking that would be good and and a quick way to cheat a little to save time.

    Reply
    • Cathy says

      December 30, 2018 at 3:09 am

      It would definitely work with puff, but I am a partial to this particular crust. Let me know if you try it with puff and what you think!

  13. Gail says

    April 16, 2019 at 6:05 pm

    5 stars
    Definitely a keeper with 5 stars!!! I wasn’t sure a standard pie crust would be that good and thought a puff pastey crust would be much better but stuck to your recipe. It was delicious with the pie crust! I just returned from a trip to Paris and had. bought Gruyere cheese so still had some on hand! Probsbly the only alteration I would make in the future is to use a commercial pie crust to save time and cut the gruyere in half with Swiss cheese (used often by French cooks) or mozarella since Gruyere is so expensive. *We were given some fresh vidalia onions yesterday right off the farm! I couldn’t wait to use them in this recipe that I had just found last week!

    Reply
    • Cathy says

      April 17, 2019 at 2:45 pm

      So glad you liked this recipe and made the crust. Yep, it will work with puff, but I’m a fan of this crust and think it makes this tart extra special. Can you send me some of those fresh vidalias??!! So jealous!

  14. maria a costales says

    May 18, 2019 at 8:13 pm

    5 stars
    For Mother’s Day i made this tart using puff pastry which i put into a tart pan, i also added dijon mustard on the bottom before adding the cheese and it came out delicious! Not one piece was left after 15 minutes!

    Reply
    • Cathy Roma says

      May 19, 2019 at 4:12 pm

      Such great tips! Love the addition of dijon! So glad you and your guests enjoyed.

  15. Daryl says

    September 15, 2019 at 3:35 pm

    5 stars
    Fantastic recipe. Used small onions and used full circles for design. Also, I added fresh tarragon to the herbs. Excellent and easy recipe. Will be using frequently going forward!

    Reply
  16. Kathy Wurster says

    November 28, 2019 at 12:09 am

    5 stars
    I made this three times and learned to separate the onion sections slightly to allow for better browning. I also melted the butter to mix with the cream at the end and brushed on. Love the tart portion too, wouldn’t substitute any other crust for that part. Also tastes good room temp. I’ve had it for breakfast and lunch!

    Reply
    • Cathy Roma says

      November 28, 2019 at 2:40 pm

      I love those tips! Thanks for sharing and I agree, the leftovers are a great lunch!

  17. Jessica says

    November 29, 2019 at 4:23 pm

    Cathy,
    I made this yesterday for a Thanksgiving appetizer. It was AMAZING! Everyone wanted the recipe and it was gone in minutes! Some people didn’t even get to try it because it was gone so quick,
    Will be making it for Christmas too! Did everything EXACTLY as your recipe said, and I could not imagine it being better any other way! Happy Holidays and THANK YOU!

    Reply
    • Cathy Roma says

      November 30, 2019 at 12:31 pm

      Oh I love this!! Thanks so much for letting me know. It’s one of my favorite things to make around the holidays and I’m so happy your guests enjoyed it!

  18. Amber says

    August 10, 2020 at 3:04 am

    I made this tonight.
    I loved it.
    My husband hated it – that means it was really good because his taste in food pretty much sucks.
    Anyways, I used a purchased dough, and just a tiny sprinkle of sugar on top before baking.
    It turned out great!!

    Reply
    • Cathy Roma says

      August 18, 2020 at 11:36 am

      Hahaha!! Glad you enjoyed it and hope your husband comes around!

  19. Susan Poole says

    October 19, 2020 at 1:53 am

    5 stars
    I am so happy to have discovered this recipe! It is certainly a staple now. I’ve made it 3 times in the last month and it comes out perfect every time. The crust is so tender– I can’t believe I can make something so special and it’s really not difficult.

    Reply
    • Cathy Roma says

      November 2, 2020 at 4:19 am

      I’m so glad you’ve been enjoying this recipe Susan. The crust is my favorite part and I use it in other savory tarts too.

  20. Carma says

    November 17, 2020 at 12:52 am

    5 stars
    This is so good!! A MILLION STARS!!!

    Reply
    • Cathy Roma says

      November 19, 2020 at 2:31 pm

      AWESOME!!! Made my day!!

  21. Lisa C. says

    December 5, 2020 at 2:12 am

    4 stars
    Really good, but they didn’t get cooked quite enough in the 30 minutes, so I will add another 10 minutes next time, and the time after that, and the time after that… Delicious.

    Reply
    • Cathy Roma says

      December 14, 2020 at 2:33 pm

      So glad you enjoyed! I find 30 mins to be right for me, but it will depend on how thinly your onions are sliced.

  22. Malinda Donovan says

    December 17, 2020 at 2:57 pm

    5 stars
    I made this yesterday after needing something special to bake and enjoy with my partner (2020 has been giving lots of these days). The pictures really helped my confidence and the dish was incredible! Thank you! Thank you!

    Reply
    • Cathy Roma says

      December 22, 2020 at 10:48 pm

      I’m so happy the photos helped. I find a lot of people learn visually, so I like to add step by step photos when I can. This is definitely a special treat and I agree, 2020 has given us plenty of reason for treats!!

  23. Brigitte says

    January 24, 2021 at 5:20 pm

    5 stars
    So so good! I took it out of the oven 12 minutes ago and I can’t stop eating it! The simplicity of the preparation makes this tart as fun to make as it is to eat!

    Reply
    • Cathy Roma says

      January 25, 2021 at 2:11 am

      So happy you’re enjoying it Brigitte!

  24. Marlene @ KISSed Quilts says

    June 20, 2021 at 2:07 am

    Used geefree Pastry. Coconut cream. Cheddar (had on hand). And Miyokos butter.Yummy!!

    Reply
    • Cathy Roma says

      June 21, 2021 at 2:13 pm

      Great substitutions! Glad you enjoyed!

  25. Vivian Harris says

    November 6, 2021 at 3:08 am

    The French onion tart recipe is fabulous! I have made it several times and it’s always mouthwateringly delicious. The pastry recipe is the best ever – so easy to make and always turns out perfectly! Thank you so much for this wonderful recipe!

    Reply
  26. Kris says

    April 16, 2022 at 1:03 am

    5 stars
    Utterly delicious. I made this tonight and it was a huge hit. Mine didn’t turn out nearly as pretty, but the fantastic taste more than made up for it. Thanks so much for this recipe.

    Reply
  27. karen says

    December 10, 2022 at 6:12 pm

    Hi Cathy I just discovered your web site and so glad I did, I am making the rice pudding today and plans to make the Onion tart. Sounds so delicious on my first date with my husband of 36 years we ate Onion Pizza, so I will surprise him with your recipe and make the tart, for our anniversary. Thank you for sharing!

    Reply

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HEY THERE, I’M CATHY.

My food philosophy is simple: everything in moderation. Sweet, savory, healthy, decadent…food, like life, is all about balance. I rely on my background as a trained chef/mom to create family-friendly recipes that will inspire you to cook, not complicate your life.

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