01 -
Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking dish lightly with butter or non-stick spray. Spread the creamy peanut butter evenly over the bottom of the prepared dish.
02 -
Sprinkle half of the chopped peanut butter cups over the peanut butter layer. Pour the sweetened condensed milk evenly over the candy layer. Sprinkle the dry chocolate cake mix evenly over the top.
03 -
Drizzle the melted butter over the cake mix, covering as much as possible. Sprinkle the milk chocolate chips and the remaining chopped peanut butter cups over the top. Bake in the preheated oven for 35–40 minutes, or until the top is bubbly and slightly crisp.
04 -
Allow the cake to cool for 10–15 minutes. Serve warm, topped with whipped cream or vanilla ice cream if desired.