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slices of missississpi mud brownies on paper towels with more in the background
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5 from 21 votes

Mississippi Mud Brownies

Gooey, and irresistible Mississippi Mud Brownies are loaded with marshmallows, coconut, pecans and fudge frosting.  Stop what you are doing and go make these now!
Prep Time15 mins
Cook Time30 mins
Total Time45 mins
Course: Dessert
Cuisine: American
Servings: 18 brownies
Calories: 400kcal
Author: Amy Nash


Brownie base

  • 1 cup butter melted
  • 2 cups sugar
  • 4 eggs
  • 2 teaspoons vanilla
  • cup cocoa powder
  • 1 cup flour
  • ½ teaspoon baking powder
  • ½ teaspoon salt
  • ½ cup coconut
  • 1 ½ cups pecans coarsely chopped and divided
  • ½ bag miniature marshmallows

Fudge frosting

  • ¼ cup butter melted
  • 3 Tablespoons cocoa powder
  • ½ teaspoon vanilla
  • 3 Tablespoons milk
  • 2 cups powdered sugar


  • Preheat oven to 350 degrees. Line a 9x13-inch baking pan with a parchment paper sling or spray with cooking spray.
  • In a large bowl, cream together the butter and sugar until light. Add in the eggs and vanilla and beat until smooth. Add cocoa, flour, baking powder, salt, coconut, and 1 cup of the chopped pecans and stir to combine.
  • Pour the brownie batter into the prepared pan and bake in the preheated oven for 30-40 minutes or until a toothpick or sharp knife inserted in the center comes out clean.
  • While the brownies are baking, mix all of the frosting ingredients together and beat until smooth. Set aside.
  • Remove the brownies from the oven and Immediately top with the marshmallows. Wait 5 minutes, then sprinkle remaining chopped pecans on top.
  • To frost, scoop dollops of frosting over the soft marshmallows while the brownies are still hot and then gently spread or nudge the dollops of frosting around to touch each other. It won't be perfect because the soft marshmallows make it tricky to truly "frost" the brownies, but it will be okay if marshmallow pokes through in places. Frosting these brownies while they are still warm helps because the frosting will melt just a bit and make for extra gooey yumminess.
  • Cool, then cut into squares and serve.


Calories: 400kcal | Carbohydrates: 52g | Protein: 4g | Fat: 22g | Saturated Fat: 11g | Polyunsaturated Fat: 3g | Monounsaturated Fat: 7g | Trans Fat: 1g | Cholesterol: 71mg | Sodium: 213mg | Potassium: 138mg | Fiber: 3g | Sugar: 41g | Vitamin A: 455IU | Vitamin C: 1mg | Calcium: 32mg | Iron: 1mg