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Are you ready for a Brownie Bars treat that combines all the best parts of desserts into one? Let me introduce you to the rich and tasty Mississippi Mud Brownies.
These aren’t just any brownie bars; they’re a magical blend of fudgy brownies, gooey marshmallows, and a rich, creamy chocolate sauce that will make you hum with joy.
Mississippi Mud Brownie Bars are perfect for any occasion – from a cozy family gathering to a big game day.
I really love the look of them. Chocolate brownies with pecans covered in a layer of marshmallow and then drizzled with more chocolate! Just gorgous!
These easy brownies are so delicious and fun to make that you’ll want to include them in your recipe box as a favorite dessert.
Plus, they’re easy to share, making them the ultimate party treat. Sharing brownies is the best way to make friends, haha!
I like my brownies super fudgy and these are all of that. It’s probably my all time favorite brownie recipe.
So, let’s get started on these mouthwatering bars that promise to be the best brownie bars you’ve ever tried!
Some of our other favorite brownie recipes we have on our site include: The BEST Homemade S’mores Brownies Recipe, Red Velvet Cookies and Cream Brownies Recipe, and Fudgy Sweetened Condensed Milk Brownies.
WHY THIS RECIPE WORKS:
- Incredible Chocolate Flavor: With a brownie base and a homemade chocolate sauce, these bars are a chocolate lover’s dream.
- Quick and Easy: Using a boxed mix makes this an easy brownie recipe that’s simple to whip up.
- Great for Sharing: The perfect size for sharing, these bars are a hit at any gathering for anyone who has a sweet tooth.
INGREDIENTS NEEDED (SCROLL TO THE BOTTOM OF THIS POST FOR THE FULL RECIPE CARD):
- Boxed brownie mix
- Chopped pecans
- Mini marshmallows
- Cocoa powder
- Milk
- Unsalted butter
- Powdered sugar
- Vanilla extract
HOW TO MAKE BROWNIE BARS:
- Heat oven to 350°F. Line a 9×11 rimmed baking sheet with parchment paper or baking cooking spray.
- In a large bowl, make the brownie mix box based on the directions on the box.
- Fold in the chopped pecans. Spread the batter into an even layer on the prepared pan.
- Bake in the oven for 15 minutes or until a toothpick inserted comes out clean. Because the bars are going to be thin, the bake time will be much shorter than the directions say on the box.
- Remove the brownies from the oven and coat with the mini marshmallows evenly.
- Place back into the oven for 3-5 minutes until the marshmallows have puffed and become soft.
- Remove from the oven and let cool on a wire rack.
- In a medium saucepan, make the chocolate sauce by combining the butter, milk, salt, and unsweetened cocoa powder over medium heat, stirring constantly. Once it is all melted, and combined with zero lumps, remove from the heat.
- Add the vanilla and powdered sugar, whisking together until smooth and creamy. If the sauce is a bit thick for drizzling over the bars, then add a little more milk to thin it out.
- Pour the chocolate sauce diagonally all over the mud brownie bars and add more pecans if desired. Allow to cool completely, then slice and serve.
FREQUENTLY ASKED QUESTIONS ABOUT THIS RECIPE:
WHAT IS MISSISSIPPI MUD?
The name comes from the original Mississippi Mud Pie.
Mississippi Mud desserts stand out for their rich, extra chocolatey base, a gooey layer of melted marshmallows, and a creamy homemade chocolate frosting on top. Often, they’re topped with pecans or walnuts for a crunchy texture.
This all makes them denser and more indulgent than regular brownies, mimicking the thick, muddy banks of the Mississippi River.
CAN I USE HOMEMADE BROWNIES?
Definitely! If you have a favorite homemade brownie recipe, feel free to use it as the base for your own personalized results.
You just have to be aware of the ratio of ingredients, since we are using a sheet tray to make these more into bars than thick brownies.
Brownie bar recipes can be changed up at will and I’ve got some great ideas for you down below.
DO THESE NEED TO BE REFRIGERATED?
Storing them in the refrigerator in an airtight container keeps them fresh and delicious for longer. But they are good at room temperature for up to 3 days.
The best part is that they’re awesome, hot or cold. The best brownie recipes are!
ANY ADDITIONS?
You’re gonna hit your daily values in chocolatey goodness with this one. Chocolate desserts are my favorite desserts!
- Stir in chocolate chips or peanut butter cups into the brownie batter for extra sweetness.
- Mix cookie dough into the brownie layer for a cookie brownie bar – chocolate chip cookie brownie bars FTW!
- Sprinkle sea salt on top of the chocolate sauce for a sweet and salty flavor.
- Add caramel sauce for a gooey layer in your brownie bars.
- Use golden brown sugar in the chocolate sauce for a rich flavor.
- Garnish with freshly whipped cream for a light and airy contrast.
ANY SUBSTITUTIONS?
Easy homemade brownies like these can easily swap for other ingredients. Here are some ideas for you.
- Coconut oil or vegetable oil can be used instead of unsalted butter for the sauce.
- Skim milk or low-fat milk for whole milk to reduce the fat content.
HOW TO STORE:
Room Temp: They can be stored at room temperature for 3 days in an air-tight container.
Refrigerator: For the best taste and texture, store the bars in an airtight container for up to a week in the fridge.
Freezer: Wrap the bars individually in plastic wrap and then place them in a freezer bag. They can be frozen for up to 3 months.
DANA’S TIPS AND TRICKS:
- Parchment paper makes removal from the pan a breeze and helps with cleanup.
- For fudgy brownies, avoid overbaking by checking doneness a few minutes early.
- Let the brownie bars cool completely on a wire rack before adding the chocolate sauce.
- Room temperature ingredients ensure the batter mixes evenly and bakes perfectly.
- Make sure they are completely cool before cutting.
Brownie Bars are your new favorite dessert. Each bite is filled with a crazy amount of flavor and textures.
Whether you’re looking for an easy weeknight dessert, a delicious way to impress guests at your next party, or just a sweet treat to enjoy, these Mississippi Mud brownie bars are sure to become a new favorite.
If you like this recipe, you might also like:
If you’ve tried these BROWNIE BARS, let me know how it turned out in the comments! You can follow me over on PINTEREST, INSTAGRAM OR FACEBOOK to find some more of our mouthwatering recipes!
Easy Mississippi Mud Brownie Bars Recipe
Ingredients
- 1 box fudge brownie mix plus ingredients needed on the back of the box
- 1 cup chopped pecans plus more for garnish
- 10 ounce bag mini marshmallows
For Chocolate Sauce:
- ⅓ cup unsweetened cocoa powder
- ¼ cup milk
- ¼ cup unsalted butter
- ¼ teaspoon salt
- 2 cups powdered sugar
- 1 teaspoon vanilla extract
Instructions
- Heat oven to 350°F. Line a 9×11 rimmed baking sheet with parchment paper or baking cooking spray.
- In a large bowl, make the brownie mix box based on the directions on the box.1 box fudge brownie mix
- Fold in the chopped pecans. Spread the batter into an even layer on the prepared pan.1 cup chopped pecans
- Bake in the oven for 15 minutes or until a toothpick inserted comes out clean. Because the bars are going to be thin, the bake time will be much shorter than the directions say on the box.
- Remove the brownies from the oven and coat with the mini marshmallows evenly.10 ounce bag mini marshmallows
- Place back into the oven for 3-5 minutes until the marshmallows have puffed and become soft.
- Remove from the oven and let cool on a wire rack.
- In a medium saucepan, make the chocolate sauce by combining the cocoa powder, milk, butter, and salt over medium heat, stirring constantly. Once it is all melted, and combined with zero lumps, remove from the heat.⅓ cup unsweetened cocoa powder, ¼ cup milk, ¼ cup unsalted butter, ¼ teaspoon salt
- Add the powdered sugar and vanilla, whisking together until smooth and creamy. If the sauce is a bit thick for drizzling over the bars, then add a little more milk to thin out2 cups powdered sugar, 1 teaspoon vanilla extract
- Pour the chocolate sauce diagonally all over the mud brownie bars and add more pecans if desired. Allow to cool completely, then slice and serve.
Notes
- Parchment paper makes removal from the pan a breeze and helps with cleanup.
- For fudgy brownies, avoid overbaking by checking doneness a few minutes early.
- Let the brownie bars cool completely on a wire rack before adding the chocolate sauce.
- Room temperature ingredients ensure the batter mixes evenly and bakes perfectly.
- Make sure they are completely cool before cutting.
Nutrition
Love This Recipe?
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Sweet, sticky, easy to make. Pretty on the table. I really like this recipe for a quick made dessert.
Thanks so much, glad you loved them!