• Preheat oven to 350°F. Line a 9x13-inch baking dish with parchment paper or spray with a non-stick spray. You could also prepare the pan with homemade pan release (GOOP).*

Cake

• In a large bowl, add the cake mix, melted butter, and egg. Mix until well combined. Press the mixture into the prepared baking pan. (The mixture will be thick)

Filling

• Sprinkle the chopped Reese's Peanut Butter Cups over the cake mix mixture.

Topping

• In a separate bowl, combine the peanut butter and miniature Reese's Peanut Butter Cups. Melt in the microwave in 20-second intervals, stir until creamy.
• Add in the cream cheese. Using an electric mixer, beat for 2-3 minutes until creamy.
• Add eggs, one at a time, mixing well.
• Add melted butter and beat until combined.
• Add in the confectioners' sugar and mix until incorporated.
• Pour the peanut butter mixture over the chopped Reese's Peanut Butter Cups and bake for 35-40 minutes. Do not overbake; the center will be slightly jiggly, but it will be done.
• Remove the bars from the oven. Let the bars cool completely before refrigerating for about 2 hours. After the bars are chilled, cut into squares and enjoy! Note: Bars will still be gooey after chilling.