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Very close up of one piece of cake so the layers are visible.
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5 from 1 vote

Mississippi Mud Cake (with cake mix)

Perfectly moist Mississippi Mud Cake is topped with mini marshmallows and an easy homemade chocolate icing. This easy Mississippi Mud Cake recipe starts with a boxed chocolate cake mix that is transformed to taste homemade using a few simple tricks. Everything is mixed by hand, and the creamy chocolate frosting reminds me of the frosting on Texas Sheet Cake or Lunch Lady Brownies.
Prep Time10 minutes
Cook Time28 minutes
Cooling Time1 hour
Total Time1 hour 38 minutes
Course: Dessert
Cuisine: American
Keyword: chocolate cake, mississippi mud cake
Servings: 16 servings
Calories: 392kcal
Author: Mindy Boyd

Ingredients

Cake

  • 1 chocolate cake mix
  • 4 eggs
  • 1 cup milk
  • ½ cup butter melted and cooled
  • 1 bag mini marshmallows 10 ounces
  • non-stick cooking spray

Icing

  • 3 cups powdered sugar
  • 3 tablespoons cocoa powder
  • ½ cup melted butter
  • 5 tablespoons milk
  • 1 teaspoon vanilla

Instructions

  • Preheat oven to 350° and coat a 9" X 13" pan with nonstick cooking spray.
    non-stick cooking spray
  • In a large bowl, mix the cake mix, eggs, milk, and melted butter with a whisk or large spoon.
    1 chocolate cake mix, 4 eggs, 1 cup milk, ½ cup butter
  • Pour the batter into the prepared pan and bake for 28-33 minutes, or until a toothpick inserted into the center comes out clean.
  • Sprinkle the marshmallows over the hot cake in an even layer. Return to the oven and bake until the marshmallows just begin to brown, about 3-5 minutes. Watch them closely so they don't burn.
    1 bag mini marshmallows
  • Let cool completely. 
  • Melt the butter. Add it and the remaining frosting ingredients to a large bowl and whisk until smooth.
    3 cups powdered sugar, 3 tablespoons cocoa powder, ½ cup melted butter, 5 tablespoons milk, 1 teaspoon vanilla
  • Pour the warm icing over the marshmallows and spread into an even layer with a spatula or the back of a large spoon. Cool completely so the icing can set before cutting and serving.

Video

Notes

Nutritional information is approximate. 
 
 

Nutrition

Calories: 392kcal | Carbohydrates: 58g | Protein: 4g | Fat: 18g | Saturated Fat: 9g | Polyunsaturated Fat: 2g | Monounsaturated Fat: 5g | Trans Fat: 0.5g | Cholesterol: 74mg | Sodium: 352mg | Potassium: 154mg | Fiber: 1g | Sugar: 44g | Vitamin A: 447IU | Calcium: 77mg | Iron: 2mg