For the chocolate chip cookie layer, press the dough into an even layer at the bottom of the pan.
Place a layer of Oreo cookies on top so it covers as much of the cookie dough as possible.
To make the brownie layer, combine the mix, eggs, oil, and water in a large bowl and stir.
Spread the batter over the Oreo layer.
Bake for 45-50 minutes or until you can stick a toothpick in the center of the brownies and only a few crumbs come out.
Let the cookie dough Oreo brownies cool completely.
Lift from the pan by the parchment paper and slice it into small squares.
Enjoy the brownies by themselves or with ice cream!