Mississippi Mud Brownies That Melt in Your Mouth Recipe
Introduction
These Mississippi Mud Brownies are irresistibly rich and gooey, melting in your mouth with every bite. Featuring a deep chocolate flavor layered with gooey marshmallows and creamy frosting, they’re a perfect treat for any chocolate lover.

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 (for frosting)
- 1/4 cup unsweetened cocoa powder (for frosting)
- 1/4 cup evaporated milk
- 1 teaspoon vanilla extract (for frosting)
- 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 well after each addition, then stir in the vanilla extract.
- Step 5: Gently fold in the flour and salt, being careful not to overmix.
- Step 6: Pour the batter into the prepared pan and bake for 25 to 30 minutes.
- Step 7: Remove the pan from the oven, sprinkle mini marshmallows evenly on top, then return to the oven for an additional 2 to 3 minutes until the marshmallows puff up slightly.
- Step 8: Allow the brownies to cool completely in the pan.
- Step 9: In a bowl, combine melted butter, 1/4 cup cocoa powder, evaporated milk, and 2 cups powdered sugar. Mix until smooth.
- Step 10: Gradually add the remaining powdered sugar to reach your desired frosting consistency.
- Step 11: Spread the frosting evenly over the cooled brownies, then cut into squares and serve.
Tips & Variations
- For extra richness, use good quality cocoa powder and real butter.
- Add chopped nuts like pecans or walnuts into the batter for added texture.
- Swap mini marshmallows for regular-sized cut into smaller pieces if mini are not available.
- If you prefer a less sweet frosting, reduce the powdered sugar gradually to taste.
Storage
Store the brownies in an airtight container at room temperature for up to 3 days, or refrigerate for up to one week. To reheat, warm individual brownies 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, regular milk can be used, but evaporated milk adds a creamier texture and richer flavor to the frosting.
How do I prevent the brownies from drying out?
Be careful not to overbake the brownies and store them properly in an airtight container. The oil and butter in the recipe also help keep them moist.
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Mississippi Mud Brownies That Melt in Your Mouth Recipe
- Total Time: 45 minutes
- Yield: 12 servings 1x
Description
Rich and gooey Mississippi Mud Brownies with a deep chocolate flavor, a marshmallow layer, and a creamy cocoa frosting that melts in your mouth. These fudgy brownies have a perfect balance of moist texture and sweet richness, making them an irresistible chocolate treat.
Ingredients
Brownie Batter
- 1 cup unsweetened cocoa powder
- 1/2 cup oil
- 1/2 cup unsalted butter, softened
- 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
- 3 cups powdered sugar
- 1 teaspoon vanilla extract
Instructions
- Prepare Oven and Pan: Preheat your oven to 350°F (175°C) and grease a 9×13 inch baking pan with non-stick cooking spray to prevent sticking and ensure easy removal of brownies.
- Mix Cocoa and Oil: In a large mixing bowl, whisk together the unsweetened cocoa powder and oil until you achieve a smooth and even mixture with no lumps.
- Add Butter and Sugar: Incorporate the softened butter into the cocoa and oil mixture, blending until creamy, then stir in the granulated sugar until fully combined.
- Incorporate Eggs and Vanilla: Add the eggs one at a time to the batter, mixing after each addition to ensure even distribution. Then stir in the vanilla extract to enhance the chocolate flavor.
- Add Dry Ingredients: Gently fold in the all-purpose flour and salt, taking care not to overmix to maintain a tender texture in the brownies.
- Bake Brownies: Pour the batter evenly into the prepared pan and bake in the preheated oven for 25-30 minutes until a toothpick inserted near the center comes out with a few moist crumbs.
- Add Marshmallows: Remove the brownies from the oven and evenly sprinkle the mini marshmallows over the top. Return the pan to the oven for an additional 2-3 minutes to allow the marshmallows to soften and slightly melt.
- Cool Brownies: Let the brownies cool completely in the pan to set, making it easier to frost and cut.
- Prepare Frosting: In a bowl, combine melted butter, unsweetened cocoa powder, evaporated milk, and 2 cups of powdered sugar. Mix until smooth.
- Adjust Frosting Consistency: Gradually add remaining powdered sugar bit by bit until you reach your desired frosting thickness and spreadability.
- Frost and Serve: Spread the creamy frosting over the cooled brownies evenly. Cut into squares and serve fresh.
Notes
- Do not overmix the batter once flour is added to ensure tender brownies.
- Use unsalted butter to control salt levels in the recipe.
- For extra gooey marshmallows, watch closely when reheating marshmallows in the oven to prevent burning.
- Allow brownies to cool completely before frosting to avoid melting the frosting.
- Store brownies in an airtight container at room temperature for up to 3 days or refrigerate to extend freshness.
- Prep Time: 15 minutes
- Cook Time: 30 minutes
- Category: Dessert
- Method: Baking
- Cuisine: American
Keywords: Mississippi Mud Brownies, chocolate brownies, gooey brownies, marshmallow brownies, chocolate frosting, homemade brownies, fudgy brownies

