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Peanut Butter Cookies: Preheat oven to 350 degrees and line two baking sheets with parchment paper.
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Beat butter, peanut butter, sugars and salt together until light and very fluffy, about 3 mins.
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Add the eggs one at a time, beating well after each addition. Mix in the vanilla.
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Add the flour, baking soda and baking powder and beat on low speed until just combined.
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Fold in the chopped peanuts.
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Divide the dough into 28 balls (I use a 1/4 cup ice cream scoop). Roll the balls in the granulated sugar and place 8 balls on each baking sheet. (You will repeat with the remaining balls once the first two sheets are baked.)
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Use the tines of a fork to make a cross-hatch pattern on each cookie, being careful not to flatten too much.
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Bake the cookies until they are just set, about 12 mins, being careful not to overbake.
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Let the cookies cool for 2-3 minutes on the baking sheet, then remove to a wire rack to finish cooling. Repeat with the remaining balls.
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Strawberry Jam Filling: Beat the fluff, cream cheese and jam together until well combined, about 2 minutes.
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In a separate bowl whip the heavy cream to stiff peaks. Fold the whipped cream into the jam mixture until just combined.
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Make the Sandwiches: Match up the cookies so the bottoms fit the tops and then turn the bottoms over. Spoon or pipe filling into the center of each bottom cookie, leaving a little space around the edge. Place the tops over the filling, press slightly, eat and enjoy!