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Preheat the oven to 350 degrees F (175 degrees C). Grease a 9-inch square baking pan.
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Mix sugar, flour, cocoa powder, salt, and baking powder together in a mixing bowl.
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Whisk butter, eggs, and vanilla together in a separate bowl. Add butter mixture to the flour mixture and mix until well combined.
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Pour 1/3 of the batter into the prepared baking pan and smooth out with a spatula. Add OREO® cookies in an even layer, then spread another 1/3 of the batter over top. Add Biscoff® cookies in an even layer, then spread remaining batter over top. (The Biscoff® layer should be two rows of 5 cookies, plus a row of 2 1/2 cookies turned sideways.)
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Bake in the preheated oven until edges are brown and center is set, 30 to 35 minutes.
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Remove pan from the oven and let brownies cool completely before slicing and serving, about 30 minutes.
Cook's Notes:
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