1: Prepare the cheesecake filling by mixing cream cheese, heavy cream, sugar, vanilla extract, and eggs in a bowl.
2: Grease the 9x9 nonstick baking pan with parchment paper.
3: Layer the bottom with cookie dough.
4: Pour the cheesecake filling over the cookie layer.
5: Crush the Oreos and sprinkle them on top of the cheesecake.
6: Prepare the fudge brownie mix as per the instructions on the package and pour over the Oreos.
7: Cook at 350°F for 1 hour and 30 minutes.
8: Check if it's ready by inserting a toothpick; it shouldn't be wet.
