Decadent Mississippi Mud Brownies: Your Ultimate Fudgy, Marshmallow, & Fudge Dream
Welcome, chocolate lovers, to a journey into pure indulgence! If you’ve ever found yourself craving a dessert that’s more than just a sweet treat – something rich, layered, and utterly satisfying – then you’ve come to the right place. Last week, a deep desire for “brownies with stuff” struck me. Not just any ordinary brownie, mind you, but one packed with layers of flavor and texture, from its chewy base to its glorious topping. It then occurred to me that while I had mastered the Mississippi Mud Cake a little over a year ago, its equally legendary brownie counterpart had somehow slipped through my baking repertoire. With all the necessary ingredients on hand, it felt like destiny. After all, is there ever truly a bad time for an extraordinary brownie?
What Makes Mississippi Mud Brownies So Irresistible?
Just like their cake cousin, these Mississippi Mud Brownies are a symphony of textures and flavors. They begin with a foundation of incredibly rich, deeply fudgy, and perfectly chewy brownies that are robust enough to carry the subsequent layers of deliciousness. What elevates them to “Mississippi Mud” status are the magnificent toppings: a generous blanket of fluffy marshmallows, a silky-smooth, intensely chocolatey fudge icing, and a scattering of crunchy chopped pecans. Each element plays a crucial role, building a dessert experience that is truly unforgettable.
The S’mores-Inspired Twist (Optional, but Highly Recommended!)
For those who adore the campfire classic, s’mores, there’s an optional step that adds an incredible dimension to these brownies. Before drizzling on the luscious fudge icing, I like to take a kitchen blow torch to the marshmallows. This creates a beautiful golden-brown char, imparting a subtle, smoky, toasted flavor that perfectly complements the rich chocolate. It’s a delightful touch that transforms these brownies into a sophisticated s’mores dream. If you’re not a fan of that toasted flavor, or simply prefer to keep things straightforward, you can absolutely skip this step without negatively impacting the brownies’ deliciousness. However, if you’re like me and can’t resist the combination of chocolate and marshmallows, especially when they’re perfectly toasted, these Mississippi Mud Brownies will be right up your alley. The gooey, melted marshmallows beneath the smooth fudge icing are pure bliss!
Why These Fudgy Brownies Are a Must-Try
- Unmatched Fudginess: Our brownie base is designed for maximum chew and chocolate intensity, made with both cocoa powder and melted butter for that deep, rich flavor.
- Layered Decadence: It’s not just a brownie; it’s an experience. Each bite delivers the chew of the brownie, the melt of the marshmallow, the smoothness of the fudge, and the crunch of pecans.
- Customizable Delight: Whether you toast your marshmallows for a s’mores vibe or leave them soft and pillowy, this recipe adapts to your preference.
- Crowd-Pleaser: Perfect for potlucks, parties, or simply a cozy night in, these brownies are guaranteed to impress and satisfy even the most discerning sweet tooth.
- Easy to Follow: Despite their elaborate appearance, the steps are straightforward, making this a rewarding baking project for any skill level.
What’s your favorite way to jazz up plain brownies? Do you add nuts, chocolate chips, caramel, or perhaps a swirl of peanut butter? Share your secrets in the comments below!
More Decadent Recipes to Explore from Our Archives:
Looking for more sweet inspiration? Here are some other delightful recipes you might enjoy from our past collections:
Two years ago: Chocolate Chip Cookie Dough Brownies and Everything Bagels
Three years ago: Homemade Pop-Tarts
Four years ago: Anise-Almond Biscotti and Better-than-Brownies Chocolate Cookies
Mississippi Mud Brownies
12
brownies
25 minutes
35 minutes
1 hour
★
★
★
★
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Ingredients
For the Brownies:
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½ cup (62.5 g) all-purpose flour -
½ cup (43 g) unsweetened cocoa powder -
¾ cup (150 g) granulated sugar -
⅓ cup (66.67 g) packed light-brown sugar -
¼ teaspoon salt -
½ cup (113.5 g) unsalted butter, melted and cooled slightly -
2 large eggs -
1 teaspoon vanilla extract -
¾ cup (74.25 g) chopped pecans, divided -
2½ cups (187.5 g) miniature marshmallows
For the Fudge Icing:
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¼ cup (56.75 g) unsalted butter -
¼ cup (61 ml) whole milk -
¼ cup (21.5 g) unsweetened cocoa powder -
½ teaspoon vanilla extract -
2 cups (240 g) powdered sugar -
Pinch of salt
Instructions
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Prepare the Brownies: Begin by preheating your oven to 325 degrees F (160 degrees C). Take an 8×8-inch square baking dish and line it with aluminum foil, ensuring there’s an overhang on the sides for easy removal later. Lightly coat the foil with non-stick cooking spray. This preparation ensures your fudgy brownies won’t stick and can be lifted out effortlessly.
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In a large mixing bowl, thoroughly whisk together the all-purpose flour, unsweetened cocoa powder, granulated sugar, light-brown sugar, and salt until they are well combined and no lumps remain. Using a sturdy wooden spoon or spatula, stir in the slightly cooled melted butter. Continue mixing until the butter is fully incorporated into the dry ingredients. At this stage, the batter may become quite thick and resemble fudge – don’t worry, this is normal! Next, add the eggs and vanilla extract. Stir vigorously until the mixture is smooth and blended, ensuring there are no visible streaks of egg or vanilla. Finally, gently fold in ½ cup of the chopped pecans. Pour the rich brownie batter evenly into your prepared baking dish. Bake for 35-37 minutes, or until a thin knife or wooden skewer inserted into the center comes out with very moist crumbs attached, but not wet batter. This indicates a perfectly fudgy brownie.
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Once the brownies are baked to perfection, remove the pan from the oven. Immediately and evenly sprinkle the miniature marshmallows over the entire top surface of the hot brownies. Return the pan to the oven for about 4 minutes, or until the marshmallows become slightly puffy and just begin to soften. Watch them carefully to prevent burning. Remove the pan from the oven and carefully transfer it to a wire cooling rack. Allow the brownies with marshmallows to rest for 5 minutes. If you desire that wonderful toasted s’mores flavor, use a kitchen torch to lightly toast the tops of the marshmallows until they are golden brown and slightly caramelized. This step is optional but adds a fantastic depth of flavor.
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Prepare the Chocolate Fudge Icing: While the brownies are cooling, start on the decadent fudge icing. In a small saucepan, melt the unsalted butter over medium-high heat, stirring frequently to prevent scorching. Once melted, add the whole milk and unsweetened cocoa powder. Cook this mixture, whisking constantly, for 1 to 2 minutes until it thickens slightly and becomes glossy. Remove the saucepan from the heat. Carefully add the powdered sugar, vanilla extract, and a pinch of salt. Using an electric mixer on medium speed, beat the mixture until the frosting is completely smooth, creamy, and free of lumps.
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As soon as the fudge icing is prepared, immediately pour and spread it evenly over the marshmallow-topped brownies. Work quickly, as this icing tends to harden rather fast once it starts to cool. Generously sprinkle the remaining chopped pecans over the still-soft chocolate icing. Allow the Mississippi Mud Brownies to cool completely at room temperature, which can take a few hours. This cooling time is crucial for the icing to set and for the brownies to achieve their perfect fudgy texture, making them easier to cut into neat squares. Store any leftover brownies in an airtight container at room temperature for up to 5 days. For a firmer texture, you can also store them in the refrigerator.
Notes
Carbohydrates: 55g,
Protein: 3g,
Fat: 18g,
Saturated Fat: 8g,
Cholesterol: 58mg,
Sodium: 76mg,
Potassium: 140mg,
Fiber: 2g,
Sugar: 44g,
Vitamin A: 400IU,
Vitamin C: 0.1mg,
Calcium: 30mg,
Iron: 1.4mg
Did you make this recipe?
We’d love to hear from you! Leave a review below and share your experience. Don’t forget to snap a picture and tag @thebrowneyedbaker on Instagram so we can admire your delicious creations!
Michelle Lettrich
Dessert
American
Expert Tips for Perfect Mississippi Mud Brownies
Achieving the ultimate Mississippi Mud Brownies is all about paying attention to a few key details. Here are some pro tips to help you bake like a seasoned pastry chef:
- Don’t Overmix the Batter: After adding the wet ingredients to the dry, mix just until combined. Overmixing develops gluten in the flour, which can lead to tough, cakey brownies instead of the desired fudgy texture.
- Melted Butter is Key: Using melted butter, rather than softened, contributes significantly to the fudgy texture of the brownies. Just ensure it’s slightly cooled before adding to the mixture to avoid cooking the eggs.
- Quality Cocoa Matters: Since chocolate is the star here, using a high-quality unsweetened cocoa powder will greatly enhance the depth of flavor in your brownies and icing.
- Don’t Overbake the Brownies: This is perhaps the most crucial tip for fudgy brownies. They are done when a thin knife or skewer inserted into the center comes out with moist crumbs, but no wet batter. A little underbaked is better than overbaked, which can result in dry brownies.
- Work Quickly with the Icing: The fudge icing sets fairly fast. Have your marshmallows on the brownies and your pecans ready before you start making the icing. Once it’s smooth, pour and spread it immediately.
- Chill for Clean Slices: While it’s tempting to dig in right away, allowing the brownies to cool completely (and ideally chilling them in the fridge for an hour or two) will make them much easier to cut into clean, perfect squares. Use a sharp knife and wipe it clean between cuts.
- Storage: Keep these brownies in an airtight container at room temperature for up to 5 days. For a denser, chewier experience, store them in the refrigerator. They are also freezer-friendly; wrap individual brownies tightly in plastic wrap and then in foil for up to 2-3 months. Thaw at room temperature.
Serving Suggestions & Variations
These Mississippi Mud Brownies are absolutely fantastic on their own, but a few simple additions can elevate them even further:
- Warm with Ice Cream: Serve a warm square with a scoop of vanilla bean ice cream or coffee ice cream. The contrast of warm and cold, and the melting ice cream, is divine.
- Drizzle with Caramel: A light drizzle of salted caramel sauce before serving can add another layer of sweetness and sophistication.
- Chocolate Shavings: Garnish with a sprinkle of chocolate shavings or curls for an elegant touch.
- Espresso Powder: A tiny pinch of espresso powder in the brownie batter (about ½ teaspoon) can deepen the chocolate flavor without making the brownies taste like coffee.
- Different Nuts: While pecans are traditional, feel free to experiment with walnuts, almonds, or even peanuts for a different nutty crunch.
- Seasonal Sprinkles: For holidays or special occasions, add festive sprinkles on top of the icing before it sets.
Frequently Asked Questions About Mississippi Mud Brownies
Here are answers to some common questions about making and enjoying these spectacular brownies:
What is “Mississippi Mud” in desserts?
“Mississippi Mud” refers to a style of dessert that typically features layers of chocolate, often with a gooey or fudgy texture, designed to evoke the rich, dark mud banks of the Mississippi River. These desserts usually include a chocolate base (like cake or brownie), a creamy or marshmallow layer, and a rich chocolate frosting or sauce.
Can I make these brownies ahead of time?
Yes, absolutely! These brownies are excellent for making ahead. They actually benefit from sitting for a few hours or even overnight, allowing the flavors to meld and the fudge icing to set perfectly. Store them in an airtight container at room temperature for up to 5 days.
What if I don’t have a kitchen torch for the marshmallows?
No problem at all! The toasting of the marshmallows is an optional step. You can simply return the brownies with the marshmallows to the oven for 1-2 minutes longer after they’ve puffed up, keeping a very close eye on them to prevent burning. They will get slightly golden and melty without the torch. Or, you can skip the toasting entirely; the marshmallows will still be wonderfully soft and gooey under the fudge icing.
Can I use full-sized marshmallows instead of miniature ones?
While miniature marshmallows are recommended for even coverage and melting, you can use full-sized marshmallows. Simply cut them into smaller pieces before sprinkling them over the hot brownies.
How do I get clean slices?
For the cleanest slices, ensure your brownies are completely cooled, and ideally chilled in the refrigerator for at least an hour. Use a large, sharp knife. For each cut, wipe the blade clean with a hot, damp cloth before slicing again. This prevents the sticky icing from dragging and ruining the appearance of your squares.
Are these brownies gluten-free or dairy-free?
This specific recipe uses all-purpose flour and dairy products (butter, milk). However, with careful substitutions, you could adapt it. For gluten-free, use a 1:1 gluten-free baking flour blend. For dairy-free, use plant-based butter alternatives and dairy-free milk (like almond or oat milk) in both the brownies and the icing. Ensure your marshmallows are also dairy-free if needed.