Preheat your oven to 350 degrees.
Line a baking tray with grease proof paper.
Follow the instructions on teh cookie mix box and stir furiously until you have a gooey cookie dough. If needed add a little extra water and oil to keep it moist as you will be baking it for longer than suggested. An extra teaspoon of each is just right.
Place cookie dough mix on the bottom of pan.
Place oreo cookies on top of cookie dough mixture.
Place brownie batter on top of oreos.
Bake for 30-35 minutes.
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