Here's what you'll need:
1 Box/Bag of Chocolate Chip Cookie Mix
1 Box of Brownie Mix
1 Pack of Double Stuff Oreos
Check the package mixes for what is needed to make each - eggs, butter, oil, etc...
Preheat your oven to 350.
Line a 8x11 Glass Baking Tray with grease proof paper - we use parchment (NOT wax paper.)
Follow the instructions for the Cookie Mix to make the cookie dough. Press the cookie dough into the bottom of the lined baking tray, until it covers the bottom evenly.
Cover this layer with Oreos. You may have a few leftovers for snacking on later.
Mix up your brownie batter per the box instructions. Pour over the oreos.
Bake for 45 to 50 minutes depending on how gooey you want the centers.
Remove from oven and allow to cool.
When its still a bit warm, use the paper to lift the brownies out of the tray and rest it on a chopping board.
Use a large, sharp knife to cut into manageable squares.