29 September 2026
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World Kitchen Journal
Mississippi Mud Brownies
The Kitchen
By Claire Beaumont, the Technique desk · United States · 2 min ·

Mississippi Mud Brownies

Mississippi Mud Brownies are delicious chocolate brownies topped with toasted pecans and marshmallows and a rich chocolate frosting.

Ingredients · Servings 10
  • One 4-ounce unsweetened chocolate baking bar, (chopped)
  • ¾ cup (1½ sticks) salted butter
  • 2 cups granulated white sugar
  • 4 large eggs
  • 1 cup all purpose flour
  • 1½ cups coarsely chopped toasted pecans
  • 3 cups miniature marshmallows
  • ½ cup (1 stick) salted butter
  • ⅓ cup milk
  • 6 tablespoons unsweetened cocoa powder
  • 16 ounces powdered sugar
  • 1 teaspoon vanilla extract
Method · 1 h 45 min
  1. Preheat the oven to 350°F. Spray a 13x9-inch baking dish with nonstick spray.
  2. In a large microwave-safe bowl, microwave the chocolate and butter for 1 to 2 minutes, or until melted and smooth, stirring at 30-second intervals. Whisk in the sugar and eggs until well-blended. Stir in the flour Spread the batter into the prepared pan.
  3. Bake for 25 to 30 minutes or until a toothpick inserted into the center comes out with a few moist crumbs. Sprinkle the warm brownies with the toasted pecans and marshmallows.
  4. In a large saucepan, cook the butter, milk and cocoa, stirring constantly, for 4 to 5 minutes or until the butter melts. Remove the pan from heat, and use an electric mixer to beat in the powdered sugar and vanilla at medium speed until smooth.
  5. Pour the frosting over the pecans and marshmallows; spread to the edges. Let cool for 1 hour on a wire rack. Cut into squares. If they're too messy, you may with to serve them on a plate with a fork!

These brownie are the best of all worlds! You’ll get a rich and fudgy brownie with layers of marshmallow and pecans too. To make things even more decadent, there is a fabulous chocolate frosting slathered on top. You can’t bake much better than these Mississippi Mud Brownies!

unsweetened chocolate

salted butter

white sugar

eggs

all purpose flour

pecans

mini marshmallows

milk

unsweetened cocoa powder

powdered sugar

vanilla extract

How to make Mississippi Mud Brownies:

The complete, printable recipe is at the end of this post.

PREPARE THE BROWNIES:

Preheat the oven to 350°F. Spray a 13×9-inch baking dish with nonstick spray.

PREPARE THE FROSTING:

Pour the frosting over the pecans and marshmallows; spread to the edges.

Let the brownies cool for 1 hour on a wire rack. Cut into squares.

If they’re too messy, you may with to serve them on a plate with a fork! They won’t be messy to eat if you give them a chance to cool and set.

These are the kind of brownies that will fly off a dessert platter at a party. Everyone loves a good brownie. And this is definitely one to savor and celebrate. Enjoy!

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