Mississippi Mud Cake Brownies Recipe – Cozy, Gooey Chocolate Heaven

Introduction
There’s something about the smell of chocolate and toasted marshmallows that stops time, and for me, that scent always means Mississippi Mud Cake Brownies are baking. As the butter melts and cocoa drifts through the kitchen, I think of rainy afternoons and family chatter, and then I sneak a corner piece while it’s still warm. If you want a rich, gooey dessert that gives hugs in every bite, this is it — and you can also peek at a fuller version of this recipe right here: Mississippi Mud Cake Brownies.

Why You’ll Love It

• Quick and easy to make, even on a weeknight.
• Comforting homemade flavor that reminds you of Sunday dinners.
• Made with simple ingredients you probably already have.
• Great for any occasion — from potlucks to quiet coffee mornings.
• Always a crowd-pleaser with crunchy pecans and gooey marshmallows.
  Also, if you like wild brownie ideas, try these Amazing Slutty Brownies for another fun twist.

Ingredients You’ll Need

• 1 cup butter — use unsalted butter so you can control the salt.
• 2 cups granulated sugar
• 4 large eggs
• 1 teaspoon vanilla extract
• 1/3 cup unsweetened cocoa powder
• 1 1/2 cups all-purpose flour
• 1/4 teaspoon salt
• 1 cup chopped pecans — lightly toast them for extra crunch and aroma.
• 4 cups mini marshmallows — fresh ones puff up beautifully.
  Frosting:
• 1/2 cup butter (for frosting)
• 1/3 cup unsweetened cocoa powder (for frosting)
• 1/3 cup milk
• 1 teaspoon vanilla extract (for frosting)
• 3 1/2 cups powdered sugar

For another butter-forward dessert, try the rich flavors in this Apple Butter Cake.

How to Make It

1. Preheat and prep. Preheat your oven to 350°F (175°C), and grease a 9×13-inch dish. This little step makes cleanup easier, and the brownies release cleanly.
2. Melt the butter. In a large bowl, melt 1 cup butter until glossy. Then, the kitchen fills with that warm, buttery scent.
3. Mix sugar, eggs, and vanilla. Stir in 2 cups granulated sugar, 4 large eggs, and 1 teaspoon vanilla extract. Beat until smooth and slightly shiny.
4. Add cocoa, flour, and salt. Sprinkle in 1/3 cup unsweetened cocoa powder, 1 1/2 cups flour, and 1/4 teaspoon salt. Stir until the batter is smooth and dark. You’ll notice a comforting chocolate aroma.
5. Fold in pecans. Gently fold in 1 cup chopped pecans so every bite has a little crunch.
6. Bake the brownies. Pour the batter into the prepared pan and smooth the top. Bake for 25–30 minutes, or until a toothpick inserted into the center comes out clean. The edges will pull away slightly and look set.
7. Add the marshmallows. Remove the pan from the oven and immediately sprinkle 4 cups mini marshmallows evenly over the warm brownies. Return to the oven for 5 minutes, until the marshmallows puff and get that golden top.
8. Make the frosting while the marshmallows puff. In a medium saucepan, melt 1/2 cup butter. Stir in 1/3 cup unsweetened cocoa powder and 1/3 cup milk until smooth. Remove from heat and stir in 1 teaspoon vanilla extract. Then gradually whisk in 3 1/2 cups powdered sugar until the frosting is glossy and spreadable.
9. Finish and cool. Pour the warm frosting evenly over the marshmallows and spread gently with a spatula. Let the whole pan cool completely so the frosting sets before cutting into squares. When your Mississippi Mud Cake Brownies come out, they’ll be glossy, pillowy, and impossible to resist.

Kitchen Tips

• Time-saver: Toast pecans in a dry skillet for 3–4 minutes while the oven heats. Then chop and toss into batter.
• Fix for gooey centers: If the center seems too soft after baking, tent the pan with foil and let it rest at room temperature for an hour — it firms up nicely.
• Flavor twist: Add a teaspoon of instant coffee to the batter for deeper chocolate flavor, or stir in a handful of chocolate chips for extra pockets of melty goodness. Also, for frosting ideas, you might like the cream cheese vibe in this Apple Cake with Cream Cheese Frosting.

Serving Ideas

• Serve warm with a scoop of vanilla ice cream for contrast, or with a mug of hot milk on chilly nights.
• Sprinkle flaky sea salt on top for a sweet-salty finish, or add a drizzle of caramel if you’re feeling indulgent.
• These brownies shine at family dinners, holiday tables, or casual bake sales. For a dessert table pairing, try something fruity like this Apple Crisp Cheesecake to balance the richness.

Storing & Leftovers

• Room temperature: Store in an airtight container for up to 3 days — bring to room temp before serving.
• Refrigerator: Keep in the fridge for up to a week, but allow to return to room temperature for the best texture.
• Freezer: Wrap squares tightly and freeze up to 3 months. Thaw in the fridge overnight, then warm gently in the microwave for 10–15 seconds.
  Leftover idea: Make brownie ice cream sandwiches by splitting pieces and adding softened vanilla ice cream between them.

FAQs

Q: Can I make this ahead of time?
A: Definitely! It often tastes even better the next day, after the flavors settle.

Q: Can I swap any ingredients?
A: Of course! Use what you have — swap pecans for walnuts or skip nuts for nut-free treats.

Q: What’s the best way to serve it?
A: Fresh from the pan while it’s still warm and aromatic, with a scoop of ice cream if you like.

Q: How do I know it’s perfectly cooked?
A: Look for golden edges and a slightly springy center; the delicious, fragrant smell tells you it’s done. Mississippi Mud Cake Brownies should be gooey but set.

Conclusion

Thanks for spending a few cozy minutes with me. If you want other takes on this indulgent favorite, take a look at Tastes Better From Scratch’s Mississippi Mud Brownies recipe for a similar classic, or try the shortcut version at Grits and Gouda’s Mississippi Mud Brownies (with Brownie Mix) for a faster bake. I hope you bake a pan soon and share it with the people you love. Every time I make them, Mississippi Mud Cake Brownies bring the house together.

Mississippi Mud Cake Brownies

Indulge in these rich, gooey Mississippi Mud Cake Brownies, filled with chocolate, toasted marshmallows, and crunchy pecans. A classic dessert for any occasion.

Print Recipe Pin Recipe

Prep Time 15 minutes mins

Cook Time 35 minutes mins

Total Time 50 minutes mins

Servings: 12 pieces

Course: Dessert, Snack

Cuisine: American

Calories: 320

Ingredients Method Notes

Ingredients

  

Brownie Ingredients

• 1 cup unsalted butter to control the salt
• 2 cups granulated sugar
• 4 large eggs
• 1 teaspoon vanilla extract
• 1/3 cup unsweetened cocoa powder
• 1 1/2 cups all-purpose flour
• 1/4 teaspoon salt
• 1 cup chopped pecans lightly toasted for extra crunch
• 4 cups mini marshmallows fresh ones puff up beautifully

Frosting Ingredients

• 1/2 cup butter for frosting
• 1/3 cup unsweetened cocoa powder for frosting
• 1/3 cup milk
• 1 teaspoon vanilla extract for frosting
• 3 1/2 cups powdered sugar

Method

 

Preparation

1. Preheat your oven to 350°F (175°C) and grease a 9x13-inch dish.
2. Melt 1 cup of butter in a large bowl until glossy.

Mixing the Batter

1. Stir in 2 cups of granulated sugar, 4 large eggs, and 1 teaspoon of vanilla extract. Beat until smooth and shiny.
2. Add 1/3 cup of cocoa powder, 1 1/2 cups of flour, and 1/4 teaspoon of salt. Stir until the batter is smooth.
3. Fold in 1 cup of chopped pecans.

Baking the Brownies

1. Pour the batter into the prepared pan and smooth the top. Bake for 25–30 minutes, until a toothpick inserted into the center comes out clean.
2. Immediately sprinkle 4 cups of mini marshmallows over the warm brownies and return to the oven for 5 more minutes until puffy.

Making the Frosting

1. In a medium saucepan, melt 1/2 cup of butter, then stir in 1/3 cup of cocoa powder and 1/3 cup of milk until smooth.
2. Remove from heat, stir in 1 teaspoon of vanilla, and gradually whisk in 3 1/2 cups of powdered sugar until glossy.

Finishing Touches

1. Pour the warm frosting over the marshmallows and spread gently. Cool completely before cutting into squares.

Notes

Toast pecans in a dry skillet for 3-4 minutes while the oven heats. Add instant coffee to the batter for deeper flavor.