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Peanut Butter Cup Dump Cake

A gooey, chocolatey dump cake layered with peanut butter, marshmallow fluff, caramel drizzle, and topped with peanut butter cups.
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Prep Time 15 minutes
Cook Time 45 minutes
Total Time 1 hour
Servings: 12 squares
Course: Dessert
Cuisine: American
Calories: 420
Ingredients Equipment Method Notes

Ingredients
  

Cake Base
  • 1 box chocolate cake mix
  • 1/2 cup butter, melted
  • 1 cup whole milk
Filling & Topping
  • 1 cup creamy peanut butter
  • 1 cup marshmallow fluff
  • 1/2 cup caramel sauce
  • 1 1/2 cups mini peanut butter cups plus extra for topping
  • 1 cup semi-sweet chocolate chips
  • 1 cup chopped roasted peanuts optional

Equipment

  • Mixing bowls
  • 9x13 baking dish
  • Spatula
  • Hand mixer or whisk

Method
 

  1. Preheat oven to 350°F (175°C). Grease a 9x13-inch baking dish.
  2. Combine cake mix, melted butter, and milk in a mixing bowl. Pour into prepared dish.
  3. Warm peanut butter slightly and dollop over batter. Swirl with a knife.
  4. Spread marshmallow fluff over the top.
  5. Sprinkle chocolate chips over marshmallow layer.
  6. Scatter chopped peanut butter cups and roasted peanuts.
  7. Drizzle caramel sauce over everything.
  8. Bake for 40–45 minutes until edges are set but center remains gooey.
  9. Cool for 15 minutes before slicing and serving.

Notes

Serve warm with ice cream for best experience.