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Mississippi Mud Cake

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Mississippi Mud Cake is a rich Southern chocolate cake topped with gooey marshmallows and a thick, fudgy chocolate frosting. It’s messy, decadent, and irresistibly delicious — a true comfort dessert.

Ingredients

  • 1 3/4 cups all-purpose flour
  • 3/4 cup unsweetened cocoa powder
  • 1 1/2 tsp baking soda
  • 1/2 tsp salt
  • 2 cups granulated sugar
  • 2 large eggs
  • 1 cup buttermilk
  • 1/2 cup unsalted butter, melted
  • 1/2 cup vegetable oil
  • 2 tsp vanilla extract
  • 1 cup boiling water or hot coffee
  • 4 cups mini marshmallows
  • 1/2 cup unsalted butter (for frosting)
  • 1/3 cup unsweetened cocoa powder (for frosting)
  • 1/3 cup milk (for frosting)
  • 1 tsp vanilla extract (for frosting)
  • 3 cups powdered sugar (for frosting)

Instructions

  1. Preheat oven to 350°F (175°C). Grease a 9×13-inch baking pan.
  2. In a large bowl, whisk together flour, cocoa powder, baking soda, salt, and sugar.
  3. In another bowl, whisk eggs, buttermilk, melted butter, oil, and vanilla.
  4. Combine wet and dry mixtures, then stir in boiling water or coffee until smooth.
  5. Pour batter into prepared pan and bake for 30–35 minutes, or until a toothpick inserted comes out clean.
  6. While hot, sprinkle marshmallows evenly over the cake. Return to oven for 2–3 minutes until puffed and softened.
  7. Remove from oven and set aside while making frosting.
  8. For frosting: In a saucepan, melt butter over medium heat. Stir in cocoa powder until smooth.
  9. Add milk and vanilla, then gradually whisk in powdered sugar until thick and pourable.
  10. Pour warm frosting over marshmallows and gently spread evenly. Let cake cool before slicing.

Notes

  • Add chopped pecans or walnuts for extra texture.
  • Use hot coffee instead of water to intensify the chocolate flavor.
  • Let frosting cool slightly before spreading if too thin.
  • Best served warm or at room temperature.

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