Preheat oven to 325
Mix brownies together, I used Ghirardelli Triple Chocolate Brownie Mix
Line a full-sheet pan with parchment paper and spray with non-stick spray
Pour brownie mixture into full-sheet pan
Mix all cheesecake swirl ingredients together, blending with hand blender until incorporated.
Spoon lumps of peanut butter cheesecake mixture over brownie into pan
Use a fork, toothpick, or skewer to swirl the cheesecake and brownie mixture together to get a marbled look.
Bake 45-55 minutes
Do not overbake, they will appear underdone, but will cool to doneness