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Mississippi Mud Cake feature
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Mississippi Mud Cake

This Mississippi Mud Cake is a moist chocolate sheet cake that is covered in melted marshmallows and is topped with a creamy chocolate fudge frosting.
Prep Time10 minutes
Cook Time30 minutes
Chill Time30 minutes
Total Time1 hour 10 minutes
Course: Dessert
Cuisine: American
Keyword: mississippi mud cake
Servings: 12 pieces
Author: Jill


  • 2 cups flour
  • 2 cups sugar granulated
  • ½ cup cocoa unsweetened
  • 2 tsp baking powder
  • 1 ½ tsp baking soda
  • ½ tsp salt
  • ½ cup oil vegetable, or canola
  • 2 eggs room temperature
  • 1 tsp vanilla extract
  • ½ cup milk whole
  • ¼ cup sour cream
  • 1 cup water boiling
  • 10 oz marshmallows mini

Chocolate Frosting


  • Preheat the oven to 350 F.
  • Lightly grease a 9x13 baking pan.
  • In a medium mixing bowl, sift together flour, sugar, cocoa powder, baking powder, baking soda, and salt. Set aside.
  • In a large mixing bowl using an electric mixer, combine oil, eggs, vanilla, milk, and sour cream until combined. Do not overmix.
  • On low speed, slowly add the boiling water. Beat on high speed for 1 minute. Add the dry ingredients to wet ingredients, and mix until fully combined.
  • Pour batter into prepared cake pan and bake for 30 minutes until toothpick comes out clean.
  • Remove cake from oven. Sprinkle the top with mini marshmallows and return to the oven for 2 minutes or until the marshmallows are puffy and slightly melted. Remove from oven and allow to cool completely.
  • In a small saucepan, melt butter. Gradually add heavy cream and cocoa powder. Cook for about 2 minutes stirring constantly.
  • Remove from heat and add vanilla and powdered sugar using a whisk. Beat until smooth. Immediately drizzle over the cooled cake. Refrigerate for 25-30 minutes until frosting has set.