Prepare the brownie mix according to the directions on the box. Pour the batter into the prepared pan. Line the top of the batter with the 16 oreos and slightly push them into the batter. Bake this layer for 35-40 minutes, until the top is set but not completely done.

Prepare the cheesecake layer by beating the cream cheese in a medium bowl until nice and smooth. Add in the sour cream and sugar and mix again until combined. Add in the egg and vanilla and mix one more time until everything is incorporated.

Pour the cheesecake mixture all over the top of the brownies and spread to the edges. Bake for another 30-35 minutes, until the edges are a light brown color and the middle doesn’t jiggle. Remove and cool for 30 minutes before topping with the chocolate.

Prepare the chocolate. Place the chocolate chips and heavy cream into a small saucepan and melt over medium heat. Stir constantly. Once the chocolate chips are completely melted and mixed in with the cream remove the pan from the stove and spoon all over the top of the cheesecake layer. Crush up the remaining 6 oreos and place all over the top.

Refrigerate for at least 2 hours, longer if possible, cut and serve. Best if stored in the fridge.