Buckle up; this is a very easy and fun one! So first, preheat oven to 300. Next, place the flour, cocoa, both the sugars, butter, vanilla, and eggs in a large bowl and mix until smooth. Fold in the chopped chocolate.
Grease a baking 9X9 brownie pan and pour the brownie mix into the pan.
Next up, let's make the cheesecake mix. Dead easy. In a bowl, mix together cream cheese, vanilla, and egg and keep going until smooth. Once mixed, spoon the cheesecake mix on top of the brownie batter and swirl through, using a butter knife. Place the Oreos over top of the brownie and put in the oven for 70 minutes.
Take from the oven and let rest for 10 mins . Now, go! Eat this. Enjoy.