Ultimate Mississippi Mud Brownies that Melt in Your Mouth Recipe
Introduction
These Ultimate Mississippi Mud Brownies are rich, fudgy, and incredibly moist with layers of gooey marshmallows and creamy chocolate frosting. Perfectly balanced between dense chocolate and sweet icing, they melt in your mouth with every bite. This recipe is a must-try for chocolate lovers looking for a decadent homemade treat.

Ingredients
- 1 cup unsweetened cocoa powder
- 1/2 cup oil
- 1/2 cup butter, softened (unsalted recommended)
- 1 cup granulated sugar
- 4 large eggs
- 1 teaspoon vanilla extract
- 1 cup all-purpose flour
- 1/2 teaspoon salt
- 2 cups mini marshmallows
- 1/2 cup melted butter
- 1/4 cup unsweetened cocoa powder
- 1/4 cup evaporated milk
- 1 teaspoon vanilla extract
- 3 cups powdered sugar
Instructions
- Step 1: Preheat your oven to 350°F and grease a 9×13” pan with non-stick cooking spray.
- Step 2: In a large mixing bowl, whisk together the oil and 1 cup cocoa powder until smooth.
- Step 3: Add the softened butter and blend until creamy, then mix in the granulated sugar.
- Step 4: Add eggs one at a time, mixing after each addition, then stir in 1 teaspoon vanilla extract.
- Step 5: Gently mix in the flour and salt, being careful not to overmix the batter.
- Step 6: Pour the batter into the prepared pan and bake for 25-30 minutes.
- Step 7: Remove the brownies from the oven, sprinkle mini marshmallows evenly on top, and return to the oven for an additional 2-3 minutes to melt the marshmallows.
- Step 8: Let the brownies cool completely in the pan before frosting.
- Step 9: In a bowl, mix melted butter, 1/4 cup cocoa powder, evaporated milk, and 2 cups powdered sugar until smooth.
- Step 10: Gradually add more powdered sugar until the frosting reaches your desired thickness.
- Step 11: Spread the frosting evenly over the cooled brownies, cut into squares, and serve.
Tips & Variations
- Use unsalted butter for better control over the saltiness in the brownies.
- For extra richness, substitute half of the oil with melted butter in the batter.
- Add chopped nuts like walnuts or pecans for a crunchy texture variation.
- If mini marshmallows aren’t available, regular marshmallows cut into smaller pieces work well.
- To make these brownies gluten-free, replace all-purpose flour with a gluten-free baking blend.
Storage
Store the brownies in an airtight container at room temperature for up to 3 days. For longer storage, keep them refrigerated for up to a week. When ready to enjoy, bring to room temperature or warm briefly in the microwave to soften the frosting and marshmallows.
How to Serve
Serve this delicious recipe with your favorite sides.
FAQs
Can I use regular milk instead of evaporated milk in the frosting?
Yes, you can substitute regular milk, but evaporated milk gives the frosting a creamier, richer texture. If using regular milk, you might need to adjust the amount of powdered sugar to maintain the right consistency.
How do I know when the brownies are done baking?
Check the brownies by inserting a toothpick into the center. A few moist crumbs should cling to it, but it shouldn’t come out wet with batter. The marshmallows added later will melt perfectly with this baking time.
PrintUltimate Mississippi Mud Brownies that Melt in Your Mouth Recipe
Indulge in the Ultimate Mississippi Mud Brownies that melt in your mouth with rich cocoa flavor, a gooey marshmallow layer, and a creamy chocolate frosting. Perfectly moist and fudgy, these brownies combine the deep taste of cocoa with a sweet, fluffy marshmallow topping and a luscious homemade frosting for a decadent dessert experience.
- Prep Time: 15 minutes
- Cook Time: 30 minutes
- Total Time: 45 minutes
- Yield: 12 servings 1x
- Category: Dessert
- Method: Baking
- Cuisine: American
Ingredients
Brownie Base
- 1 cup unsweetened cocoa powder
- 1/2 cup oil
- 1/2 cup butter, softened (preferably unsalted)
- 1 cup granulated sugar
- 4 large eggs
- 1 teaspoon vanilla extract
- 1 cup all-purpose flour
- 1/2 teaspoon salt
Topping
- 2 cups mini marshmallows
Frosting
- 1/2 cup melted butter
- 1/4 cup unsweetened cocoa powder
- 1/4 cup evaporated milk
- 1 teaspoon vanilla extract
- 3 cups powdered sugar
Instructions
- Preheat and Prepare Pan: Preheat your oven to 350°F (175°C) and grease a 9×13-inch baking pan with non-stick cooking spray to ensure easy removal of the brownies.
- Mix Cocoa and Oil: In a large mixing bowl, whisk together the unsweetened cocoa powder and oil until smooth and well combined, forming a rich chocolate base.
- Add Butter and Sugar: Stir in the softened butter until creamy, then blend in the granulated sugar, ensuring the mixture is well combined and slightly fluffy.
- Incorporate Eggs and Vanilla: Add the eggs one at a time, mixing thoroughly after each addition to incorporate air, then stir in the vanilla extract to enhance the chocolate flavor.
- Combine Dry Ingredients: Gently fold in the all-purpose flour and salt, taking care not to overmix to maintain a tender brownie texture.
- Bake the Brownies: Pour the batter evenly into the prepared pan and bake in the preheated oven for 25 to 30 minutes, until the edges are set and a toothpick inserted near the center comes out with moist crumbs.
- Add Marshmallow Topping: Remove the brownies from the oven and immediately sprinkle the mini marshmallows evenly over the surface. Return to the oven for an additional 2 to 3 minutes until the marshmallows become puffed and slightly golden.
- Cool the Brownies: Allow the brownies to cool completely in the pan on a wire rack, which prevents the frosting from melting.
- Prepare Frosting: In a mixing bowl, combine the melted butter, unsweetened cocoa powder, evaporated milk, and 2 cups of powdered sugar. Stir until smooth and creamy.
- Adjust Frosting Consistency: Gradually add the remaining powdered sugar, mixing thoroughly until the frosting reaches your desired thickness for easy spreading.
- Frost the Brownies: Spread the chocolate frosting evenly over the cooled brownies with a spatula, covering the marshmallow layer completely.
- Serve: Cut the brownies into squares and serve. Enjoy the rich, gooey, and perfectly balanced chocolate treat!
Notes
- Do not overmix the batter after adding the flour to avoid dense brownies.
- Use unsalted butter for more control over the saltiness.
- Ensure brownies are completely cooled before frosting to prevent melting and sliding.
- The marshmallow topping can be broiled for a minute if you prefer toasted marshmallows, but watch closely to avoid burning.
- Store brownies in an airtight container at room temperature for up to 3 days or refrigerate for longer freshness.
Keywords: Mississippi Mud Brownies, chocolate brownies, gooey marshmallow brownies, homemade frosting, rich chocolate dessert

