They're called Slutty Brownies because they're oh so easy, and more than a little bit filthy.
Preheat your oven to 350°F Line a baking tray with grease proof paper. Follow the instructions on the cookie mix box & stir furiously until you have gooey cookie dough, I usually add a little extra water and oil to what they suggest, it just keeps it moist as you'll be baking it for longer than suggested. An extra teaspoon of each is just right. Squidge (technical term) the cookie dough into a lined baking tray, until it covers the bottom. Cover this layer with your Oreos. Mix up your brownie batter. Just stick to the recipe on the box for this one & pour over your Oreos. Bake for 30mins. Remove from the oven and leave to cool. When its still a little bit warm, use the paper to lift your creation out of the tray and rest it on a chopping board. Use a large, sharp knife to cut it into manageable chunks, sections, slabs... depending on how many calories you think you can handle in one sitting.