01 -
Preheat the oven to 350 °F (175 °C) and thoroughly grease a 9×13-inch baking dish.
02 -
Combine the chocolate cake mix, eggs, oil, and water as directed on the packaging. Mix until the batter is smooth, then spread evenly into the prepared baking dish.
03 -
In a clean bowl, beat together the melted butter, softened cream cheese, creamy peanut butter, and vanilla extract until fully combined and smooth. Gradually add powdered sugar, blending until a creamy and fluffy mixture forms.
04 -
Spoon generous dollops of the cream cheese and peanut butter filling over the chocolate cake batter. Gently swirl with a knife or spatula without fully combining the layers, ensuring a marbled appearance.
05 -
Evenly sprinkle the semi-sweet chocolate chips and chopped Reese’s Peanut Butter Cups over the top surface.
06 -
Place in the oven and bake for 45 to 50 minutes, or until a toothpick inserted near the center emerges with a few moist crumbs, indicating doneness.
07 -
Allow to cool slightly before slicing and serving. For an enhanced experience, consider enjoying warm with a scoop of vanilla ice cream.