Prepare brownie mix as directed on package but DO NOT BAKE...... the baking step will come later !
Gently fold in your peanut butter chips and the vanilla extract, set this off to the side...
It should look like this...
In a separate bowl using an electric mixer beat the cream cheese and sugar together with the egg until its a smooth consistency......
Preheat oven to 350 degrees....Spray baking pan with butter nonstick cooking spray......
Spread HALF of brownie mix into bottom of prepared baking pan......
Dollop cream cheese mixture over half of brownie batter.....
Pour other half of brownie mixture over cream cheese mixture
Using a dull butter knife gently swirl cream cheese mixture into brownie mixture......you want it to have a marbled look....
Bake in your 350 degree oven between 20 - 23 minutes.... youll know its done when you insert a toothpick into the middle of it and it comes out nice and clean......
Cool for 20-30 minutes, cut into bars, eat and enjoy !
