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If you are craving a dessert that embodies rich chocolate goodness with a luscious, gooey finish, you must try this Mississippi Mud Bars Recipe. These bars are an irresistible blend of fudgy brownie base, a soft marshmallow layer, and a silky chocolate glaze that melts in your mouth. They bring together simple ingredients to create a decadent treat perfect for sharing or indulging on a cozy night in.

Ingredients You’ll Need
These ingredients are straightforward but essential — each one plays a crucial role in building the rich texture and deep chocolate flavor that’s so signature to this Mississippi Mud Bars Recipe.
- 1 â…“ cups all-purpose flour: Provides the structure needed for the fudgy brownie base.
- 1 cup granulated sugar: Adds sweetness and helps create a tender crumb.
- 1 cup light brown sugar: Brings moisture and a hint of caramel flavor to balance the cocoa.
- 1/2 cup unsweetened cocoa powder: Gives the intense chocolate flavor underpinning the entire bar.
- 1/2 teaspoon baking soda: Helps the brownies rise just enough for a soft yet sturdy texture.
- 1/2 teaspoon salt: Enhances and balances the sweetness.
- 1 cup salted butter (melted): Contributes richness and a moist, chewy bite.
- 4 large eggs: Bind the ingredients together and add a lightness to the texture.
- 1/2 Tablespoon vanilla extract: Adds warmth and depth to the chocolate flavor.
- 1 bag (10 ounces) mini marshmallows: Creates the signature gooey, melty layer that makes these bars truly special.
- 1/4 cup milk: Helps make the chocolate glaze smooth and pourable.
- 1/4 cup salted butter: Adds creaminess and shine to the glaze.
- 1/3 cup unsweetened cocoa powder: Packs the glaze with rich chocolate flavor.
- 2 cups powdered sugar: Sweetens and thickens the glaze to the perfect consistency.
- 1 teaspoon vanilla extract: Completes the glaze with a lovely vanilla note.
How to Make Mississippi Mud Bars Recipe
Step 1: Prepare the Base
Start by preheating your oven to 350 degrees Fahrenheit and lining a 10×15-inch rimmed baking sheet with parchment paper. Lightly grease the parchment with cooking spray to prevent sticking. This step ensures your bars will come out perfectly shaped and easy to remove from the pan.
Step 2: Mix the Batter
In a large bowl, whisk together the all-purpose flour, granulated sugar, light brown sugar, cocoa powder, baking soda, and salt. Once these dry ingredients are evenly combined, stir in the melted butter, eggs, and vanilla extract. Mix the batter just until all ingredients are incorporated — overmixing could make the bars less tender, so be gentle!
Step 3: Bake the Brownie Layer
Pour and spread the batter evenly into your prepared pan. Bake in the preheated oven for 16 minutes or until a toothpick inserted in the center comes out clean. Keep an eye on them so they don’t overbake — this short baking time keeps them fudgy and moist.
Step 4: Add the Marshmallows
As soon as you take the bars out, evenly sprinkle the mini marshmallows over the hot surface. Return the pan to the oven for just 2 more minutes. This melting-softening step creates that classic gooey layer without fully melting the marshmallows, giving the bars their unique texture and look. Let the pan cool completely before moving on.
Step 5: Make the Chocolate Glaze
While the bars cool, prepare the glaze by heating milk and salted butter in a medium saucepan over medium heat until the butter melts. Whisk in cocoa powder until smooth, then remove from heat and blend in powdered sugar and vanilla extract. Let the glaze cool slightly so it thickens just enough to drizzle.
Step 6: Glaze and Serve
Drizzle the luscious chocolate glaze evenly over the cooled bars. Allow it to set completely — this not only adds a glossy finish but also a rich extra layer of chocolate flavor. Once set, cut into 24 bars and serve. You’re in for an unforgettable chocolate experience!
How to Serve Mississippi Mud Bars Recipe
Garnishes
For an extra touch of flair, try sprinkling a few finely chopped toasted nuts like pecans or walnuts on top of the glaze before it sets. You could also add a light dusting of cocoa powder or a few whole mini marshmallows for an inviting presentation. These little details make the bars look as delightful as they taste.
Side Dishes
These Mississippi Mud Bars shine splendidly on their own but pairing them with a scoop of vanilla bean ice cream or a dollop of freshly whipped cream elevates the dessert to a heavenly level. A cup of strong coffee or cold milk also complements the intense chocolate flavor perfectly.
Creative Ways to Present
Consider arranging the bars on a rustic wooden board for a cozy gathering or stacking them in a pretty tiered dessert stand for parties. For a festive touch, drizzle additional white chocolate over the bars or decorate individual servings with edible gold dust. These creative ideas turn your Mississippi Mud Bars Recipe into a show-stopping centerpiece.
Make Ahead and Storage
Storing Leftovers
Once your Mississippi Mud Bars have been glazed and cut, store any leftovers in an airtight container in the refrigerator. They stay moist and delicious for 3-4 days, making them a perfect dessert to enjoy over several days without losing their charm or texture.
Freezing
If you want to prepare these bars ahead of time, you can freeze them after glazing and cutting. Wrap individual bars tightly in plastic wrap and place them in a freezer-safe container or bag. They’ll keep beautifully for up to 2 months. When ready to enjoy, thaw them overnight in the refrigerator.
Reheating
To bring back that freshly-baked warmth, reheat the bars in a microwave for 10-15 seconds or until just warmed through. This quick warm-up revives the gooey marshmallow layer and softens the chocolate glaze, making every bite taste like you just pulled them from the oven.
FAQs
Can I use regular marshmallows instead of mini marshmallows?
Yes, you can use regular marshmallows, but cut them into smaller pieces so they melt evenly and create that soft, gooey layer typical of this recipe.
Is it necessary to melt the butter before adding it to the batter?
Melting the butter helps blend the ingredients smoothly and contributes to a chewy, fudgy texture in the bars. Using melted butter is definitely recommended for the best results.
Can I make these bars gluten-free?
To make this Mississippi Mud Bars Recipe gluten-free, substitute the all-purpose flour with a gluten-free baking blend at a 1:1 ratio. Just ensure the blend has xanthan gum for structure.
What’s the best way to cut the bars neatly?
Wait until the chocolate glaze has fully set and use a sharp knife for cutting. Wiping the knife clean between cuts helps keep the edges clean and prevents drag from the glaze or marshmallow.
Are these bars very sweet?
These bars offer a balanced sweetness, combining rich chocolate and marshmallow with just enough sugar to satisfy your sweet tooth without being overwhelming. The salted butter also helps mellow the overall taste.
Final Thoughts
If you’re searching for a dessert that combines nostalgic comfort with rich, gooey chocolatey bliss, give this Mississippi Mud Bars Recipe a whirl. It’s a delightful treat that everyone will love, crafted from simple ingredients with a spectacular result. Trust me, once you make these bars, they’ll quickly become a favorite to bake again and again.
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Mississippi Mud Bars Recipe
- Prep Time: 20 minutes
- Cook Time: 18 minutes
- Total Time: 38 minutes
- Yield: 24 servings
- Category: Dessert
- Method: Baking
- Cuisine: American
Description
Deliciously rich Mississippi Mud Bars featuring a moist chocolate base topped with mini marshmallows and a smooth chocolate glaze. These bars combine the fudgy texture of brownies with a creamy, chocolaty frosting, perfect for a decadent dessert or a sweet treat to share.
Ingredients
For the Bars
- 1 â…“ cups all-purpose flour
- 1 cup granulated sugar
- 1 cup light brown sugar
- 1/2 cup unsweetened cocoa powder
- 1/2 teaspoon baking soda
- 1/2 teaspoon salt
- 1 cup salted butter, melted
- 4 large eggs
- 1/2 tablespoon vanilla extract
- 1 bag (10 ounces) mini marshmallows
For the Chocolate Glaze
- 1/4 cup milk
- 1/4 cup salted butter
- 1/3 cup unsweetened cocoa powder
- 2 cups powdered sugar
- 1 teaspoon vanilla extract
Instructions
- Preheat Oven and Prepare Pan: Preheat the oven to 350 degrees F. Line a 10×15-inch rimmed baking sheet with parchment paper and lightly grease it with cooking spray to prevent sticking. Set it aside.
- Mix Dry Ingredients: In a large bowl, whisk together all-purpose flour, granulated sugar, light brown sugar, unsweetened cocoa powder, baking soda, and salt until fully combined to ensure even flavor distribution.
- Add Wet Ingredients: Stir the melted salted butter, eggs, and vanilla extract into the dry ingredients. Mix just until combined, being careful not to overmix to keep the bars tender and moist. Spread the batter evenly in the prepared pan.
- Bake Bars: Bake for 16 minutes or until a toothpick inserted in the center comes out clean. Avoid overbaking to maintain fudginess.
- Add Marshmallows and Soften: Remove from oven and evenly sprinkle mini marshmallows over the top of the warm brownies. Place the pan back in the oven for an additional 2 minutes to soften the marshmallows without melting them completely. Remove and let cool completely before glazing.
- Prepare Chocolate Glaze: In a medium saucepan over medium heat, combine milk and butter. Heat until the butter melts. Whisk in unsweetened cocoa powder until smooth. Remove from heat and whisk in powdered sugar and vanilla extract until well combined. Allow the glaze to cool slightly to thicken.
- Glaze and Serve: Drizzle the chocolate glaze evenly over the cooled bars. Let the glaze set completely before cutting into 24 squares. Serve and enjoy the rich, chocolatey delight.
Notes
- Do not overmix the batter to avoid tough bars.
- Baking times may vary depending on oven; check with a toothpick.
- Let bars cool completely before glazing for best results.
- If glaze is too thick, add a teaspoon of milk to thin it slightly.
- Store bars in an airtight container at room temperature for up to 3 days.

