Layered Brownies

Preheat the oven to 350 degrees F (175 degrees C). Grease a 9-inch square baking pan.

Mix sugar, flour, cocoa powder, salt, and baking powder together in a mixing bowl.

Whisk butter, eggs, and vanilla together in a separate bowl. Add butter mixture to the flour mixture and mix until well combined.

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.)

Bake in the preheated oven until edges are brown and center is set, 30 to 35 minutes.

Remove pan from the oven and let brownies cool completely before slicing and serving, about 30 minutes.