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Mississippi Mud Bars Recipe Easy Homemade Marshmallow Fudge Topping

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Rich and comforting Mississippi Mud Bars topped with a homemade marshmallow fudge frosting, perfect for cozy evenings and crowd-pleasing dessert cravings.

Ingredients

Scale
  • 1 cup (2 sticks) unsalted butter, melted
  • 2 cups granulated sugar
  • 1/2 cup unsweetened cocoa powder, sifted
  • 4 large eggs, at room temperature
  • 2 teaspoons vanilla extract
  • 2 cups all-purpose flour (or almond flour for gluten-free)
  • 1/2 teaspoon salt
  • 1 cup chopped pecans or walnuts (optional)
  • 1 (7 oz) jar marshmallow cream (or fluff)
  • 1/2 cup unsalted butter, softened
  • 2 cups powdered sugar, sifted
  • 1 teaspoon vanilla extract

Instructions

  1. Preheat your oven to 350°F (175°C). Grease a 9×13-inch pan with butter or non-stick spray, then lightly dust with cocoa powder to avoid sticking.
  2. Melt 1 cup (2 sticks) unsalted butter in a microwave-safe bowl or on the stove until fully liquid but not hot. Let cool slightly.
  3. Whisk 2 cups granulated sugar and 1/2 cup sifted unsweetened cocoa powder into the melted butter until no lumps remain and mixture is thick and glossy.
  4. Add 4 large eggs one at a time, whisking thoroughly after each addition. Stir in 2 teaspoons vanilla extract until batter is smooth and shiny.
  5. Gently fold in 2 cups all-purpose flour and 1/2 teaspoon salt using a rubber spatula. Mix just until combined; do not overmix.
  6. Fold in 1 cup chopped pecans or walnuts if using.
  7. Pour batter evenly into the prepared pan and bake for 25-30 minutes until edges are set but center is slightly soft. A toothpick inserted should come out with moist crumbs.
  8. While bars bake, beat 1/2 cup softened unsalted butter until creamy. Gradually add 2 cups sifted powdered sugar, mixing well.
  9. Stir in 1 (7 oz) jar marshmallow cream and 1 teaspoon vanilla extract until smooth and spreadable.
  10. When bars are out of the oven and cooled for 10-15 minutes, spread the marshmallow fudge topping evenly over the warm bars.
  11. Allow bars to cool completely on a wire rack before slicing into squares, about 1 hour at room temperature or 30 minutes in the fridge.

Notes

Use room temperature eggs for smoother batter. Sift cocoa powder and powdered sugar to avoid lumps. Do not overbake to keep bars fudgy. Spread topping on warm bars for best melting effect. Let bars cool completely before slicing to avoid crumbling. Nuts are optional and can be replaced or omitted for allergies. For dairy-free, use vegan butter and dairy-free marshmallow cream.

Nutrition

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