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4.83 from 23 votes

Mississippi Mud Brownies

My favorite one-bowl brownie recipe topped with warm gooey marshmallows and chocolate frosting. 
Prep Time10 mins
Cook Time25 mins
Total Time35 mins
Course: Dessert
Cuisine: American
Servings: 24
Calories: 245kcal
Author: Lauren Allen

Ingredients

For the brownies:

  • 1/3 cup unsweetened cocoa powder
  • 1/2 cup oil (vegetable or canola oil)
  • 1/2 cup butter , softened
  • 2 cups granulated sugar
  • 4 large eggs
  • 2 teaspoons vanilla extract
  • 1 1/2 cups all-purpose flour
  • 1 teaspoon salt
  • 3 cups mini marshmallows

For the frosting:

  • 1/2 cup melted butter
  • 1/3 cup unsweetened cocoa powder
  • 1/3 cup evaporated milk
  • 1 teaspoon vanilla extract
  • 3 - 3 1/2 cups powdered sugar

Instructions

  • Preheat oven to 350 degrees F. Grease a 9x13'' pan with non-stick cooking spray.
  • In a large mixing bowl, pour oil over cocoa powder and mix. Add softened butter and mix until smooth. Add sugar and mix for 1 minute. 
  • Add eggs, one at a time, mixing after each addition. Add vanilla and mix. Add flour and salt and stir to combine. 
  • Pour batter into prepared pan. Bake for 25-30 minutes or until a toothpick inserted into the center comes out clean.
  • Remove brownies from the oven and sprinkle the marshmallows evenly on top. Return to the oven for 2-3 minutes or until the marshmallows are puffed. Remove from oven and allow them to cool completely.
  • Once brownies are cool, make the frosting.

For the frosting:

  • Add melted butter, cocoa powdered, evaporated milk, vanilla, and 2 cups of powdered sugar to a mixing bowl and beat with electric beaters until smooth. 
  • Add more powdered sugar, a cup at a time, mixing well, until you reach your desired frosting consistency. I usually use about 3 1/4 cups powdered sugar.
  • Spread frosting over the cooled brownies and cut into squares. I've found a plastic knife works best to cut them, or if you make them 1 day in advance they are much easier to cut.
  • Have you tried Mississippi Mud Cake?

Video

Notes

Don't miss my tips for making and storing these brownies in the post above.

Nutrition

Calories: 245kcal | Carbohydrates: 29g | Protein: 2g | Fat: 13g | Saturated Fat: 5g | Cholesterol: 52mg | Sodium: 185mg | Potassium: 67mg | Fiber: 1g | Sugar: 20g | Vitamin A: 290IU | Vitamin C: 0.1mg | Calcium: 20mg | Iron: 0.9mg