Preheat your oven to 350°F / 175°C.
Mix all the brownie ingredients together until smooth and pour into a lined or lightly greased baking pan.
In a separate bowl, mix the cookie layer ingredients until combined.
Add the cookie batter on top of the brownie layer and lightly swirl/spread it throughout.
Top with crushed Oreos and chocolate squares.
Bake for approximately 25–30 minutes.
Let it cool slightly, cut into 8 big slices and ENJOY.
