If you’re a chocolate lover looking for a treat that’s rich, gooey, and completely indulgent, these Mississippi Mud Brownies are exactly what you need. A delightful twist on the classic Mississippi Mud Cake, these brownies layer dense chocolate, soft marshmallows, and silky ganache into one irresistible dessert. Perfect for a weekend treat, special occasion, or just to satisfy a chocolate craving, they promise every bite will have you asking for more.
These brownies take all the best parts of a traditional mud cake but simplify the process. By using brownies as a base, you get a sturdier, denser chocolate foundation that’s easy to handle while keeping every bite decadent. The addition of mini marshmallows on top creates a light, fluffy layer that melts into the chocolate, while the ganache finishing touch elevates them to dessert perfection.
Why You’ll Love These Brownies
Many recipes for Mississippi Mud Cake can be tricky, especially when it comes to spreading a fluffy marshmallow layer over a soft cake. Here, that step is simplified: instead of trying to pipe or spread a marshmallow frosting, you scatter mini marshmallows over the freshly baked brownies. They puff up, soften, and form a perfectly even topping without any mess.
The chocolate ganache adds a glossy, rich finish that’s customizable depending on your chocolate preference. Use milk chocolate for a milder, creamy taste or semisweet chocolate if you want a more intense chocolate hit. No matter which you choose, the combination of brownie, marshmallow, and ganache makes for a truly indulgent dessert.
These brownies are also surprisingly simple to make. While making brownies from scratch ensures maximum flavor and control over ingredients, you can streamline the process by using a boxed brownie mix if you prefer. The steps remain the same: bake the brownies, top with marshmallows, pour over a smooth ganache, and optionally sprinkle with nuts. Even first-time bakers can achieve professional-looking results.
Ingredients That Make the Difference
The secret to these brownies is using the right chocolate. Unsweetened chocolate forms the base of the brownies and balances the sweetness of the sugar and marshmallows. Combined with semisweet chocolate chips, it creates a deep, rich chocolate flavor that is neither overpowering nor too sweet. Fresh eggs, high-quality butter, and a touch of vanilla bring everything together for a moist, tender brownie base.
Optional additions like pecans or extra chocolate chips folded into the batter enhance texture and flavor. The mini marshmallows melt over the brownies in the oven, creating a soft, pillowy layer. The ganache topping, made from heavy cream and chocolate chips, adds a glossy, luxurious layer that makes these brownies look as decadent as they taste.
Tips for Perfect Brownies
- Eggs at room temperature: This helps the batter mix more evenly and results in a smoother brownie texture. If you forget to take eggs out in advance, warm them gently in hot water for a few minutes.
- Even baking: Make sure to line your pan with parchment paper and butter the sides. This prevents sticking and makes lifting the brownies out of the pan easy.
- Don’t overbake: The center should still be slightly underbaked when you take the brownies out. The marshmallow layer will finish the baking process, ensuring a soft, fudgy texture.
- Ganache consistency: Pour over warm brownies and use an offset spatula to smooth it evenly. If the ganache is too thick, a small splash of additional cream can help.
Step-by-Step Overview
- Melt unsweetened chocolate, butter, and semisweet chocolate chips in a saucepan. Let cool slightly.
- Whisk eggs with sugar and vanilla, then fold in the melted chocolate.
- Sift flour, baking powder, and salt into the mixture, fold in pecans or chocolate chips if desired.
- Pour the batter into a prepared 9×13-inch pan and bake until the edges are set but the center is slightly underbaked.
- Immediately top with mini marshmallows and return to the oven for a few minutes until puffed and soft.
- Prepare ganache by simmering heavy cream and pouring over chocolate chips, stirring until smooth.
- Pour ganache over marshmallows, smooth, and sprinkle chopped pecans on top if desired.
- Let brownies cool, then chill briefly for easier slicing.
These brownies can be stored at room temperature or in the fridge for up to a week, making them a perfect make-ahead treat for gatherings, holidays, or simply to keep on hand for dessert cravings.
Decadent Gluten-Free Mississippi Mud Brownies
- Total Time: 1 hr 30 min
Ingredients
Brownie Base
4 oz (113 g) unsweetened chocolate, chopped
2/3 cup (151 g) unsalted butter, sliced
3/4 cup (128 g) semisweet chocolate chips
1 1/3 cups (160 g) gluten-free all-purpose flour*
1 tsp baking powder
1/2 tsp kosher salt
4 large eggs (200 g), at room temperature**
2 cups (396 g) granulated sugar
2 tsp vanilla extract
1/2 cup (85 g) semisweet chocolate chips (optional)
1 cup (114 g) chopped pecans (optional)
Marshmallow Layer
10 oz (283 g) mini marshmallows
Ganache Topping
3/4 cup (177 ml) heavy cream
12 oz (340 g) chocolate chips (milk or semisweet)
Extra chopped pecans for garnish (optional)
Instructions
- Preheat the oven to 350°F (177°C). Butter a 9×13-inch pan and line with parchment, leaving overhang for easy removal.
- Prepare the brownie batter: In a medium saucepan, melt unsweetened chocolate, butter, and 3/4 cup semisweet chocolate chips over medium heat, stirring until smooth. Remove from heat and let cool 5 minutes.
- In a large bowl, whisk eggs until combined. Add sugar and vanilla, mixing well. Gradually stir in the melted chocolate mixture.
- Sift in flour, baking powder, and salt. Fold in optional chocolate chips and pecans. Pour batter evenly into the prepared pan.
- Bake: 31 minutes or until a toothpick inserted 1 inch from the corner comes out with moist crumbs. Do not overbake; center should remain slightly underbaked.
- Add marshmallows: Immediately cover brownies with mini marshmallows, creating an even layer. Return to oven for 4 minutes or until puffed and softened.
- Prepare ganache: While marshmallows bake, bring heavy cream to a simmer. Place chocolate chips in a heatproof bowl, pour hot cream over them, and let sit 1–2 minutes. Stir from center outward until smooth.
- Finish brownies: Pour ganache over marshmallow layer, smooth with an offset spatula. Sprinkle with chopped pecans if desired. Let cool to room temperature, then chill 30 minutes for easier slicing.
- Serve: Lift brownies from pan using parchment overhang, cut into squares, and enjoy. Store covered at room temperature or in the fridge up to one week.
Notes
- Gluten-Free Flour: Use 120 g per cup of your favorite gluten-free flour blend. Measure by weighing ingredients for accuracy. Recommended blends: Pamela’s All-Purpose Artisan, Bob’s Red Mill 1-to-1, or King Arthur Measure for Measure.
- Room Temperature Eggs: If you forget to leave eggs out, warm them in hot tap water for 8 minutes. Pat dry before using.
- Ganache Coverage: For full top coverage, increase heavy cream to 1 cup (237 ml) and chocolate chips to 14 oz (397 g). Mini chocolate chips melt faster than regular chips.
- Prep Time: 15 min
- Cook Time: 40 min
