Preheat oven according to the directions on the brownie box. Line a 9x9-inch pan with aluminum foil and set aside.
In a large bowl, make the chocolate chip cookie dough mix according to package directions. In a separate bowl, mix the brownie mix according to package directions.
Press the chocolate chip cookie dough evenly into the bottom of the lined pan. Place the Oreos on top in a single layer. Pour the brownie mix on top.
Bake according to the directions on the brownie box. Make sure a toothpick comes out clean (it might take longer than the recommended baking time).
Remove from oven and allow to cool slightly. Cut into pieces and serve.
by The Savvy Kitchen