Preparation
Step 1
Preheat the oven to 350 degrees F (175 degrees C). Grease a 9-inch square baking pan.
Step 2
Mix sugar, flour, cocoa powder, salt, and baking powder together in a mixing bowl.
Step 3
Whisk butter, eggs, and vanilla together in a separate bowl. Add butter mixture to the flour mixture and mix until well combined.
Step 4
Pour 1/2 of the batter into the prepared baking pan and smooth out with a spatula. Add 16 Oreo cookies in an even layer (4 rows of 4 cookies), then spread the remaining 1/2 of the batter on top.
Step 5
Bake in the preheated oven until edges are brown and center is set, 30 to 35 minutes.
Step 6
Remove pan from the oven and set on a wire rack. Let brownies cool completely, at least 30 minutes.
Step 7
Crush 12 of the remaining Oreo cookies. Place whipped topping in a bowl and fold in crushed cookies; spread mixture over the top of the brownies. Crush the remaining 4 cookies; sprinkle over the top of the whipped cream mixture.
Step 8
Keep refrigerated until you are ready to slice and serve.
©allrecipes
Ingredients
1 ½ cups white sugar
¾ cup all-purpose flour
½ cup high-quality unsweetened cocoa powder
½ teaspoon salt
¼ teaspoon baking powder
¾ cup unsalted butter, melted
3 large eggs
1 teaspoon vanilla extract
32 chocolate sandwich cookies (such as Oreo), divided
1 (8 ounce) container frozen whipped topping (such as Cool Whip), thawed