Preheat oven to 350 degrees.
Line an 8x8 baking dish with parchment paper and set aside.
In a large mixing bowl, combine the brownie mix according to package directions.
Lightly spray your parchment paper with cooking spray and spread half of the brownie mixture into the pan. Be sure to spread the mixture evenly.
In a small mixing bowl, combine the cream cheese, egg, sugar or stevia, vanilla extract and peanut butter and mix well. (You may want to use an electric mixer to ensure it is completely smooth)
Drop large spoonfuls of the cheesecake mixture over the brownies.
Spoon the remaining brownie batter over the top and use a toothpick to create swirls.
Bake for 30-35 minutes. Mine were perfect at 33 minutes.
Serving: 1 Brownie, Calories: 230kcal, Carbohydrates: 35.3g, Protein: 3.9g, Fat: 8.6g, Cholesterol: 26.3mg, Sodium: 164.2mg, Fiber: 2.6g, Sugar: 24.5g