Step 1: Preheat the Oven

1. Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking dish and set aside.

Step 2: Prepare the Chocolate Base

1. In a large bowl, combine the cake mix, melted butter, and eggs. Mix until a thick batter forms.
2. Spread the batter evenly into the prepared baking dish.

Step 3: Make the Peanut Butter Filling

1. In another large bowl, beat the cream cheese and peanut butter until smooth and creamy.
2. Add the eggs and vanilla extract, mixing until well incorporated.
3. Gradually mix in the powdered sugar until smooth and thick.

Step 4: Assemble and Bake

1. Pour the peanut butter filling over the chocolate base, spreading it evenly.
2. Bake for 40–45 minutes, or until the edges are set but the center remains slightly gooey.

Step 5: Cool and Serve

1. Let the cake cool completely before slicing to ensure it holds its shape.
2. Serve as-is or with a scoop of vanilla ice cream for extra indulgence.