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Easy Mississippi Mud Cake Recipe

This easy Mississippi mud cake recipe is made the old-fashioned way with marshmallows and a fudgy frosting.
Prep Time30 minutes
Cook Time25 minutes
Total Time55 minutes
Servings: 12 servings
Calories: 424kcal
Author: Lucy Brewer

Ingredients

Cake

  • ½ cup cocoa
  • 2 sticks unsalted butter, melted
  • 2 cups granulated sugar
  • 4 large eggs, room temperature
  • 1 ½ cups all-purpose flour
  • 1 ½ cups chopped nuts (optional)
  • ⅛ teaspoon salt
  • 1 teaspoon vanilla
  • 10 ounces mini marshmallows (one bag)

Frosting

  • ½ cup unsalted butter, softened
  • ⅓ cup cocoa powder
  • 3 ¾ cups powdered sugar
  • ½ cup whole milk

Instructions

Cake

  • Preheat oven to 350 degrees F. Lightly grease a 9x13-inch baking dish.
  • Whisk ½ cup cocoa into 2 sticks unsalted butter, melted until well blended. 
    A mixing bowl containing a yellow liquid and brown powder sits on a counter, with additional bowls of ingredients nearby. A blue towel lies beside the bowl.
  • Add 2 cups granulated sugar and 4 large eggs, room temperature, and either whisk or use a hand mixer. 
    A glass bowl with creamed sugar and butter topped with an egg, next to a bowl of cocoa powder and a carton of eggs on a white surface.
  • Beat in 1 ½ cups all-purpose flour, 1 ½ cups chopped nuts (optional), 1/8 teaspoon salt, and 1 teaspoon vanilla.
    A glass bowl filled with chocolate batter sits on a counter, with a bowl of mini marshmallows and a bowl of powdered sugar nearby.
  • Scrape batter into prepared dish and bake for about 25 minutes. 
    A white baking dish filled with chocolate batter on a light surface, with a small bowl of marshmallows and a small bowl of a white ingredient nearby.
  • Remove the cake from the oven and immediately top with 10 ounces mini marshmallows (one bag). Then top the marshmallows with chocolate frosting.
    A rectangular baking dish filled with numerous small white marshmallows, surrounded by ingredients like butter and flour.

Frosting

  • Using a hand mixer, blend together 1/2 cup unsalted butter, softened, 1/3 cup cocoa powder and 3 3/4 cups powdered sugar. Mix in ½ cup whole milk until frosting is smooth and creamy.
    A glass bowl filled with smooth cake batter on a light-colored countertop beside a textured blue cloth.
  • Frosting will be thick, so just drop it over the marshmallows and then smooth out. Allow the cake to cool before cutting.
    A white rectangular baking dish filled with a chocolate dessert with a textured surface. The edges of a white crust are visible along the sides. A blue cloth is partially seen in the lower left corner.
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