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overhead shot of stack of mississippi mud brownies

Mississippi Mud Brownies

Using an upgraded box mix, this Mississippi Mud Brownies recipe has a gooey brownie layer, fluffy marshmallow and decadent ganache!
5 from 5 votes
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Course: Dessert
Cuisine: American
Keyword: mississippi mud brownies
Prep Time: 10 minutes
Cook Time: 30 minutes
Total Time: 40 minutes
Servings: 16
Calories: 383kcal

Ingredients

  • 18.3 ounce box brownie mix plus ingredients to make them
  • 2 cups marshmallow fluff
  • 1/2 cup unsalted butter melted
  • 1/3 cup unsweetened cocoa powder
  • 1/3 cup heavy cream
  • 1/4 teaspoon fine sea salt
  • 4 cups powdered sugar
  • 1/4 cup mini marshmallows cut in half

Instructions

  • Preheat the oven according to the package directions for the brownie mix. Coat a 9x13 pan with cooking spray or parchment paper.
  • Prepare brownies according to package directions. Remove and set aside.
  • While brownies are still warm, place marshmallow fluff in a microwave-safe bowl or glass measuring bowl. Heat for 30 seconds on high heat, stir. If not smooth, return for another 30 seconds and then stir again.
  • Pour over warm brownies, spreading out evenly using an offset spatula. Set aside.
  • In the bowl of a stand mixer fitted with a paddle attachment or a large mixing bowl with an electric hand mixer, beat together the melted butter, cocoa powder, heavy cream and salt until combined.
  • Add the powdered sugar slowly so the mixture is still pourable, but starts to have a little body and texture.
  • Pour over the marshmallow layer, spreading out with an offset spatula.
  • While the chocolate ganache layer is still tacky, sprinkle mini marshmallows and gently press to adhere. Allow them to fully cool.
  • Cut brownies into squares.
  • If you've tried this recipe, come back and let us know how it was in the comment or star ratings!

Notes

It is easiest to cut marshmallows in half using kitchen shears. 

Nutrition

Calories: 383kcal | Carbohydrates: 71g | Protein: 2g | Fat: 12g | Saturated Fat: 6g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 4g | Trans Fat: 0.2g | Cholesterol: 21mg | Sodium: 135mg | Potassium: 34mg | Fiber: 1g | Sugar: 56g | Vitamin A: 250IU | Vitamin C: 0.03mg | Calcium: 8mg | Iron: 1mg