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Ooey, Gooey Mississippi Mud Cake

  • Author: Roz | La Bella Vita Cucina
  • Prep Time: 15 minutes
  • Additional Time: 0 hours
  • Cook Time: 25 minutes
  • Total Time: 40 minutes
  • Yield: 12 servings 1x


This Mississippi Mud Cake is a chocolate lovers dream! A delicious chocolate cake with a layer of fudgy brownies, melted marshmallows, and warm chocolate frosting. This cake is irresistible and your family and guests will beg for seconds! Have ice cold milk and/or water for your guests to drink because this is super sweet. Steaming hot cups of java would also go well with this decadent cake!


Units Scale

For The Cake

  • 1 cup (2 sticks) butter
  • 1/2 cup cocoa powder
  • 4 eggs, beaten well
  • 1 tsp vanilla extract
  • 2 cups sugar
  • 1 1/2 cups all purpose flour
  • 1/4 tsp salt

For The Frosting

  • One 16-ounce box (3 1/4 cups) powdered sugar (I’d cut this in half to decrease the sweetness)
  • 1/2 cup cocoa powder
  • 1/2 cup (1 stick) butter, melted
  • 1/2 cup milk (add more if it is too thick to ‘pour’ over the cake) **
  • 1 tsp vanilla extract
  • 4 cups mini marshmallows


To make the cake

  1. Heat the oven to 350F. Grease and flour a 13×9 inch pan.
  2. In a medium saucepan combine the butter and cocoa powder and cook over medium heat, stirring now and then, until the butter is melted and the mixture is well blended.
  3. Stir in the beaten eggs, vanilla, sugar, flour, and salt and beat until the batter is well combined and the flour has disappeared.
  4. Quickly pour the batter into the prepared pan and bake for 25 minutes.
  5. While the cake bakes, prepare the frosting so it is ready to pour over the hot cake.

For the frosting

  1. In a medium bowl combine the powdered sugar and cocoa powder; mix well.
  2. Add the melted butter, milk and vanilla; beat everything together well.
  3. Set aside until cake is done.
  4. Remove cake from the oven, scatter marshmallows over the top and then return the cake to the hot oven for about 3 minutes to soften the marshmallows.
  5. Place the cake, still in the pan, on a wire rack.
  6. Pour the frosting all over the marshmallow covered cake.
  7. Cut the cake into squares and serve.


  • ** You may also substitute buttermilk for a richer, tangier chocolate frosting. It goes well with the super sweetness of the frosting and the super sweetness of the marshmallows.
  • Serve with glasses of cold milk, ice water or steaming cups of coffee due to the level of sweetness of this delicious cake.
  • The frosting is warm and gooey upon the first pour and is magnificent to eat at that point, however:
  • The frosting becomes more ‘jelled’, but not hard as it cools. If you want it more gooey and fluid, just put the cake in the oven again at 350 degrees for about 5 – 10 minutes (keeping a good eye on it) to soften the frosting and to re-warm it. YUM!!!!

Keywords: chocolate cake, Mississippi Mud Cake, chocolate dessert, Mississippi Mue Pie

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