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Mississippi Mud Brownies

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Mississippi mud brownies are rich, chocolaty and delicious. With layers of brownie, marshmallows and a chocolate icing it is a fun dessert that is perfect for sharing.

Close up of piece of mississippi mud brownies with layer of chocolate brownie, white marshmallow layer and chocolate icing on top.

This fun brownie recipe is a fun twist on Mississippi mud cake. It has a fudgy brownie base topped with gooey marshmallows and a quick chocolate icing. You can add nuts if you like, or let the chocolate flavor really shine on its own.

When you live on the edge of the Mississippi River, desserts called Mississippi mud catch your attention. We happen to know a little bit about the real mud, in fact Little Dude did some gold prospecting in that mud last weekend.

Piece of mississippi mud brownie in front of pan of remaining brownies.

He didn’t strike it rich, but he had a good time. In the end, that is what really matters.

Mississippi mud desserts run the gamot of treats. There are everything from ice cream desserts to layered pudding desserts.

Then there is the cake these brownies are modeled off of. The thing they all have in common is chocolate and the characteristic brown muddy color.

Making the brownies

The recipe is built on a 9×13″ pan of brownies. You can make your favorite recipe or use a mix.

We made our own brownie mix in a jar. This particular batch had white baking chips inside and they were a lovely addition.

Feel free to add nuts, chocolate chips or whatever your brownie preference is. With all of the toppings, no mix ins are really required.

Topping the Brownies

Bake the brownies according to the recipe or package directions. Then top the hot brownies with marshmallows.

We used large marshmallows, so we cut them in half for even coverage. You can do a layer of mini marshmallows if you prefer.

This is another chance to add nuts if you like them. Or just do the fluffy marshmallows.

Put the pan back in the oven for a few minutes. They should puff up a bit and get good and gooey.

That is what is going to stick them to the brownie base. I even ran the broiler for just a minute to give them a light golden brown color.

Let the marshmallows and brownies cool before adding the icing. That’s what takes these to the next level.

Chocolate Icing

Get out a saucepan and melt a stick of butter. Add some milk and cocoa powder and stir.

You don’t really need to bring it to a boil, but it will thicken a bit. Remove it from the heat and stir in vanilla and powdered sugar.

Lifting piece of mississippi mud brownie out of pan.

This is yet another point that you could add chopped nuts if you want. Relatively finely chopped pecans would be great.

While the icing is warm, drizzle it over your brownies. Let it set before cutting.

Tips for Serving

It is sometimes easier to use a plastic knife to cut through marshmallows. For whatever reason it seems to stick less.

The marshmallows will also cut easier the next day. So if you can make these a day ahead, feel free.

Stack of layered rocky road style brownies on plate.

Though the gooey marshmallow pull from a fresh batch is worth the extra mess. So do whatever is easiest.

You will likely want a nice cold glass of milk or mug of hot coffee. Then just enjoy it!

More Great Chocolate Desserts

Enjoy the goodness of s’mores without the campfire! Easy s’mores bars start with a cake mix, so they take just a few ingredients and hardly any prep. 

Peanut butter chocolate cake mix cookies are the perfect way to make a sweet treat in a hurry. They only take 4 simple ingredients and a few minutes to put together, but that can be out little secret.

Start with a chocolate cake mix and just a handful of ingredients and whip up some gooey chewy turtle bars in no time.

Mississippi mudslide cake pairs a homemade chocolate cake with pecans, coconut, marshmallows and fudgy icing. It is decadent, delicious and loaded with goodness.

Love this recipe? Give it a ⭐⭐⭐⭐⭐ review in the recipe card below!

Close up of piece of mississippi mud brownies with layer of chocolate brownie, white marshmallow layer and chocolate icing on top.

Mississippi Mud Brownies

Servings: 16 Servings
Author: Carlee
Mississippi mud brownies are rich, chocolaty and delicious. With layers of brownie, marshmallows and a chocolate icing it is a fun dessert that is perfect for sharing.
4.93 from 52 ratings
Prep Time 10 minutes
Cook Time 40 minutes
Total Time 50 minutes



  • 1 cup all purpose flour
  • 1 teaspoon baking powder
  • cups granulated sugar
  • 1 teaspoon salt
  • 1 cup cocoa powder
  • 1 cup chocolate chips
  • 1 cup oil
  • 3 large eggs
  • 1 teaspoon vanilla extract


  • 10 oz. bag marshmallows
  • ½ cup butter
  • ¼ cup milk
  • ½ cup cocoa powder
  • 1 teaspoon vanilla extract
  • cups powdered sugar


  • Preheat oven to 350°F and grease a 9×13-inch pan.
  • In a large bowl stir together the flour, salt, baking powder, cocoa powder, and sugar.
    1 cup all purpose flour, 1 teaspoon baking powder, 1½ cups granulated sugar, 1 teaspoon salt, 1 cup cocoa powder
  • Add the oil, vanilla and eggs, Stir to combine. Fold in chocolate chips (I used white chips, but your favorite will do.)
    1 cup oil, 3 large eggs, 1 teaspoon vanilla extract, 1 cup chocolate chips
  • Bake for 25-30 minutes.
  • Top hot brownies with marshmallows and return to the oven for 2-3 minutes or until they are puffy. Broil them for a few seconds if you want them to toast slightly.
    10 oz. bag marshmallows
  • Allow the brownies and marshmallows to cool.
  • In a saucepan, melt butter over medium heat. Stir in milk and cocoa powder.
    ¼ cup milk, ½ cup cocoa powder, ½ cup butter
  • Remove from heat and stir in vanilla and powdered sugar.
    1 teaspoon vanilla extract, 3½ cups powdered sugar
  • Drizzle warm chocolate icing over marshmallows and brownies.
  • Allow to set completely before cutting and serving.
  • Store leftovers in an airtight container at room temperature for up to 5 days.



Serving: 1pieceCalories: 526kcalCarbohydrates: 75gProtein: 4gFat: 25gSaturated Fat: 7gPolyunsaturated Fat: 16gCholesterol: 50mgSodium: 240mgFiber: 2gSugar: 59g

Nutritional Disclaimer

“Cooking With Carlee” is not a dietitian or nutritionist, and any nutritional information shared is an estimate. If calorie count and other nutritional values are important to you, we recommend running the ingredients through whichever online nutritional calculator you prefer. Calories and other nutritional values can vary quite a bit depending on which brands were used.

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Recipe Rating


Thursday 13th of July 2023

Do you think if this recipe is tripled it would fit in a half pan?


Thursday 13th of July 2023

Doubled probably would, I think tripled might be too much unless you sheet pan has 2-inch sides.

Karen @karenskitchenstories

Friday 19th of August 2022

You are killing me with these. I seriously need these in my life.


Saturday 20th of August 2022

Do it!!!


Monday 30th of May 2022

These sound so good. Could you use Marshmallow fluff instead of the regular Marshmallows and what would this be like for texture if the leftovers we're refrigerated? Thank you for the recipe.


Monday 30th of May 2022

I don't see why you couldn't use marshmallow fluff. It may be a challenge to spread, but it would taste amazing. I think the texture would be good chilled, but would likely be better if eaten at room temperature.

Andrea Nine

Friday 29th of October 2021

What a delicious yummy sounding brownie! I will do a Mississippi mud theme Sunday dinner and make these when I make my Mississippi mud roast!


Friday 23rd of June 2023

@Andrea Nine, what is Mississippi mud roast?


Friday 29th of October 2021

That is such a fun idea! Thanks, Andrea