To make the brownie layer add the cocoa powder, flour, espresso powder and baking powder into a large bowl and use a whisk to combine.
In a separate bowl, add the melted butter, brown sugar, white sugar vanilla extract and eggs. Mix until really well combined.
Add the dry ingredients to the wet ingredients and use a rubber spatula to combine. Add the chocolate chips and fold in.
Pour the brownie batter on top of your cookie and Oreo layer. Use an offset spatula to carefully smooth over the Oreos.
Place in the oven and bake for 50-55minutes. Take out of the oven and allow to cool for 4 hours. Slicing these brownies up while they’re still or hot or even warm will be a disaster. They’ll just fall apart. Use the baking paper overhang to lift the brownies out of the oven. Use a large knife to slice up 4x4!
If you want to take your slutty brownies even further, you could add a scoop of cookies and cream ice cream and drizzle some chocolate sauce on top!