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Mississippi Mud Brownies

Mississippi Mud Brownies

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  • Author: Nicole Nared-Washington from Brown Sugar Food Blog
  • Total Time: 40 mins
  • Yield: 12 1x


These Mississippi Mud Brownies are super chocolaty, gooey, and rich. This is for the chocolate lovers at heart! Brownies topped with marshmallow and chocolate frosting.


  • 1 Box of Brownie Mix (including the required ingredients egg, water, and oil)
  • 16 oz. Marshmallows
  • Frosting
  • 1 stick unsalted butter
  • 3 tbsp unsweetened cocoa powder
  • 6 tbsp. milk
  • 1 tsp. Vanilla extract
  • 3 c. powdered sugar
  • Pinch of salt


  1. Preheat oven to 350 Degrees and spray a 9X13 casserole dish with baking spray and set aside.
  2. Using a large bowl, prepare the brownie mix as instructed using the correct amount of water, oil, and eggs. Pour in the sprayed 9X13 casserole dish. Bake for 20-25 minutes until the middle of the brownies are baked through.
  3. While the brownies are baking prepare the frosting. In a medium saucepan melt the stick of butter, add the cocoa powder, and milk. Allow to come to a slight simmer. Remove from heat and whisk in the powdered sugar until smooth. Add the salt and vanilla extract.
  4. Once the brownies are finished baking, add the marshmallows on top of the brownies while still warm, and pour on top of the marshmallows. Place back in the oven for 2-3 minutes until marshmallows are gooey and slightly puffed. Remove from oven and pour the frosting mixture on top of the marshmallows. NOTE: You may not need to use the entire frosting mixture as I did not. Place in the refrigerator for 30 minutes or longer to allow the frosting to set. Cut into squares and serve.
  • Prep Time: 10 mins
  • Cook Time: 30 mins
  • Category: Dessert