Easy as 123. All u need is two packages of Nestlé toll house cookie dough, package of Oreos, and a box of brownie mix.... (I made the cookie dough from scratch, but it's less time consuming just buying it made) Line the 13x9 pan with foil, spray cooking spray, lay the cookie dough down, then the Oreos, and pour the brownie batter on top. Bake at 350 for 40 mins. And there you go. Heaven in a pan.