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Close-up handheld photo of a Chocolate Peanut Butter Dump Cake slice showing the viscous peanut butter drizzle dripping down the side.

Chocolate Peanut Butter Dump Cake: The Ultimate Decadent Layered Dessert

A decadent, layered Chocolate Peanut Butter Dump Cake featuring a moist dark chocolate base, airy marshmallow fluff, glossy chocolate ganache, and a viscous peanut butter drizzle. Perfect for indulgent dessert lovers and food photography enthusiasts.
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Prep Time 15 minutes
Cook Time 35 minutes
Total Time 50 minutes
Servings: 12 slices
Course: Desserts
Cuisine: American
Calories: 485
Ingredients Equipment Method Notes

Ingredients
  

Ingredients
  • 15.25 oz (432g) Dark Chocolate Cake Mix Devil's Food preferred
  • 1 cup (240ml) Whole Milk
  • 1/2 cup (115g) Unsalted Butter Melted
  • 7 oz (198g) Marshmallow Fluff One jar
  • 1 cup (175g) Semi-Sweet Chocolate Chips
  • 1/2 cup (120ml) Heavy Whipping Cream
  • 1/2 cup (125g) Creamy Peanut Butter For drizzling
  • 1/2 cup (50g) Peanut Butter Cookie Crumbles Golden and crispy
  • 1/2 cup Reese's Peanut Butter Cups Chopped
  • 1/4 cup Roasted Peanuts Halved

Equipment

  • 1 9x13 inch baking dish Ceramic preferred
  • 1 Offset spatula For smoothing layers
  • 1 Heat-proof glass bowl For ganache

Method
 

Preparation and Baking
  1. Preheat oven to 350°F (175°C). Whisk cake mix, milk, and melted butter until glossy. Pour into greased 9x13 dish and bake for 25-30 minutes until moist crumbs appear on a toothpick.
  2. While the cake is warm, dollop and spread the marshmallow fluff in an even white layer using an offset spatula. Let sit for 10 minutes to set.
Topping and Finishing
  1. Heat heavy cream until simmering; pour over chocolate chips. Let sit for 5 minutes, then whisk until a glossy dark ganache forms. Pour over the marshmallow layer.
  2. Sprinkle chopped PB cups, peanuts, and cookie crumbles over the wet ganache. Microwave peanut butter until liquid and drizzle in a thick stream over the center.

Notes

Use a warm, damp knife for clean slices.
Do not boil the cream for ganache or it may separate.