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Preheat oven to 400 degrees and grease a 9x13 inch baking pan.
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Lay strips of bacon on a parchment lined baking sheet and sprinkle with brown sugar and cinnamon and drizzle with maple syrup.
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Bake until browned, about 20 minutes, then cool and coarsely chop. Set aside.
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Spread cubed bread on baking sheet and toast in oven, until just lightly golden, about 20 minutes. Cool and place in large bowl.
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Heat 1 Tbsp butter in a saute pan, add onion and cook until softened, 6-8 minutes. Cool to room temperature.
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Whisk eggs, add milk, cream, nutmeg, salt and pepper and whisk again.
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Add onion and gruyere and stir to combine.
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Pour egg mixture over bread cubes and toss.
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Pour bread mixture into prepared pan and sprinkle with bacon.
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Wrap tightly in plastic wrap and refrigerate overnight.
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The next day, heat oven to 375 degrees and bake strata uncovered for 30-40 minutes or until cooked through and golden brown.