Gooey, and irresistible Mississippi Mud Brownies are loaded with marshmallows, coconut, pecans and fudge frosting. Stop what you are doing and go make these now!

If you love brownies, make sure you don’t miss our Cream Cheese BrowniesEasy Caramel Pecan Brownies, Gooey Swirled Nutella Brownies, and our triple-decker Slutty Brownies.

A baking dish filled with Mississippi Mud Brownies and someservings removed with scattered marshmallows and walnuts around it

When it comes to sweet treats, and especially brownies, I like them crazy and over the top like these Easy Caramel Pecan Brownies and Cream Cheese Brownies.

But I have to admit that if I was to choose an all-time favorite chocolate dessert, these Mississippi Mud Brownies are the ultimate for me.

They are loaded with pecans and coconut in the most perfect, decadent chocolate brownie and then topped with mini marshmallows, more chopped pecans, and a soft, gooey fudge frosting. They are so rich and wonderful and they will make you famous with all of your friends and co-workers if you make them for them.

And for good reason - they are absolutely over the top wonderful in all the right ways.

slices of missississpi mud brownies on paper towels with more in the background

The batter itself is fudgy and rich thanks to the four eggs that go into it.

Getting brownie batter just right is really a matter of having a good ratio of eggs to butter to flour.

Too much flour and they turn out cakey.

Too few eggs and they just aren't rich and fudgy enough.

But what really makes this brownie batter special, in my opinion, is adding just enough coconut for a chewier brownie than you might be used to.

The texture is just so surprisingly perfect without it being all "coconutty" for people who aren't into that.

an upclose view of the corner of the baking dish filled with Mississippi Mud Brownie

And the chopped pecans in the batter give the extra bit of richness and crunch that I just can't resist in baked goods.

I don't think it's fair to call these "Mississippi Mud Brownies" without the pecans - then they would just be more of a marshmallow brownie. Wonderful, no doubt, but not a dessert of the Mississippi Mud variety.

And since pecans are southern and Mississippi is in the South, it only makes sense, doesn't it?

a full baking dish filled with gooey Mississippi Mud Brownie

These are guaranteed to vanish at any bake sale, potluck, or dessert table at a party or gathering. Which is probably when you will want to make them because they are impossible to resist when they are sitting on your kitchen counter. I mean, just look at the swirls or frosting and marshmallow on this pan full of yumminess!

an aerial view of the Mississippi Mud Brownies in a baking dish

Ingredients to make Mississippi Mud brownies

  • Butter: I use salted butter in almost all of my baking. You could use oil instead, But I find that it doesn’t give the richness of butter.
  • Granulated Sugar: Without sugar, the unsweetened cocoa powder would make these brownies pretty bitter!
  • Eggs: Eggs help to bind everything together.
  • Vanilla: This common baking ingredient amplifies the other flavors, rather than being noticeable on its own.
  • Cocoa Powder: Cocoa powder is essential for chocolate brownies, but relies on sugar to bring in the sweetness.
  • All-purpose flour: I use unbleached all-purpose flour in this recipe and in most of my baking unless I specify otherwise.
  • Baking Powder: This keeps the brownies from being too dense.
  • Salt: Can’t make baked goods without a little salt!
  • Coconut: This is an integral part of what makes these brownies "Mississippi Mud" brownies. It adds a subtle coconut flavor, plus great texture.
  • Pecans: A staple in many Southern dishes, chopped pecans add great flavor and texture to these brownies!
  • Miniature Marshmallows: These add sweetness and gooey pockets of deliciousness to these brownies.
  • Milk: I like to use whole milk or 2% milk when baking, but 1% and non-fat will work fine for the frosting as well.
  • Powdered Sugar: Essential for making frosting!
Mississippi Mud Brownies in a baking dish with several squares removes and placed on small pieces of parchment paper

How do I store Mississippi Mud Brownies?

You can store these brownies in the refrigerator with a loose covering to prevent sticking to the frosting. I suggest pulling them out and letting them sit out on the counter for an hour to come to room temperature before serving. They'll keep for up to 4 days.

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Mississippi Mud Brownies

5 from 22 votes
Amy Nash
Prep Time 15 mins
Cook Time 30 mins
Total Time 45 mins
Course Dessert
Cuisine American
Servings 18 brownies
Gooey, and irresistible Mississippi Mud Brownies are loaded with marshmallows, coconut, pecans and fudge frosting.  Stop what you are doing and go make these now!


Brownie base

  • 1 cup butter melted
  • 2 cups sugar
  • 4 eggs
  • 2 teaspoons vanilla
  • cup cocoa powder
  • 1 cup flour
  • ½ teaspoon baking powder
  • ½ teaspoon salt
  • ½ cup coconut
  • 1 ½ cups pecans coarsely chopped and divided
  • ½ bag miniature marshmallows

Fudge frosting

  • ¼ cup butter melted
  • 3 Tablespoons cocoa powder
  • ½ teaspoon vanilla
  • 3 Tablespoons milk
  • 2 cups powdered sugar


  • Preheat oven to 350 degrees. Line a 9x13-inch baking pan with a parchment paper sling or spray with cooking spray.
  • In a large bowl, cream together the butter and sugar until light. Add in the eggs and vanilla and beat until smooth. Add cocoa, flour, baking powder, salt, coconut, and 1 cup of the chopped pecans and stir to combine.
  • Pour the brownie batter into the prepared pan and bake in the preheated oven for 30-40 minutes or until a toothpick or sharp knife inserted in the center comes out clean.
  • While the brownies are baking, mix all of the frosting ingredients together and beat until smooth. Set aside.
  • Remove the brownies from the oven and Immediately top with the marshmallows. Wait 5 minutes, then sprinkle remaining chopped pecans on top.
  • To frost, scoop dollops of frosting over the soft marshmallows while the brownies are still hot and then gently spread or nudge the dollops of frosting around to touch each other. It won't be perfect because the soft marshmallows make it tricky to truly "frost" the brownies, but it will be okay if marshmallow pokes through in places. Frosting these brownies while they are still warm helps because the frosting will melt just a bit and make for extra gooey yumminess.
  • Cool, then cut into squares and serve.


Calories: 400kcal | Carbohydrates: 52g | Protein: 4g | Fat: 22g | Saturated Fat: 11g | Polyunsaturated Fat: 3g | Monounsaturated Fat: 7g | Trans Fat: 1g | Cholesterol: 71mg | Sodium: 213mg | Potassium: 138mg | Fiber: 3g | Sugar: 41g | Vitamin A: 455IU | Vitamin C: 1mg | Calcium: 32mg | Iron: 1mg
Tried this recipe? Show me on Instagram!Mention @HouseOfNashEats or tag #houseofnasheats!

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About the author

Hi, I'm Amy

I enjoy exploring the world through food, culture, and travel and sharing the adventure with mostly from-scratch, family friendly recipes that I think of as modern comfort cooking.

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Reader questions and reviews

  1. 5 stars
    Wow Amy! These brownies are really over the top amazing! All my favorite things in one delicious, gooey and decadent brownie! I am happy just thinking about making them - and drooling just a bit! Pinning to make them this week!

  2. 5 stars
    All you have to say is brownies...and my family would come running. In fact...I made brownies for Easter dessert. These are a chocolate lovers dream. My hubby would be ALL over these.

  3. 5 stars
    I am practically drooling at my screen. I love marshmallows so I'm here for this recipe! Plus who can say no to chocolate?!

  4. 5 stars
    Ooohhhh girl. These are calling my name. Pecans, marshmallows, chocolate fudgey brownies all wrapped up together and smothered with frosting? Yes please!!! I need these ASAP. They will be a huge hit for my family and friends!

  5. 5 stars
    I've never made brownies from scratch! I only like gooey brownies though- so I'm pretty sure I could wipe these out in a few minutes flat 😛 These look ridiculously good- I can see why they're your favorite!

  6. 5 stars
    When you go for over the top, you really go for it! It's not enough to make awesome brownies, when you can top them with marshmallows and pecans and then finish it all off with frosting. Yum! These would be gone at the bake sale before I could blink.

  7. 5 stars
    Irresistible is correct! I've been lamenting the fact that there's no dessert in my house tonight, and looking at these brownies, I might need to get to baking right now! They look perfectly decadent and just the kind of thing you want to indulge in for a special treat.

  8. 5 stars
    Holy moly, these live up to their name! I know I couldn't resist. I'd have to forego the marshmallows because for some reason, they're one of those things I just can't bring myself to like, but I think this recipe would be totally bomb without them anyway! That brownie cake is perfection and really, for me, the best part. Is it bad that I'm craving brownies now? At 10am? 😐

  9. 5 stars
    I need a square right now!! WOW! they do look so gooey and rich I would be in chocolate heaven. I have got to make them for my family -- we are all brownie lovers and these brownies take it to the next level.