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Decadent Mississippi Mud Oreo Brownies: The Ultimate Chocolate Indulgence

Are you craving an incredibly rich, utterly decadent chocolate dessert that promises pure bliss? Look no further than these spectacular Mississippi Mud Oreo Brownies! Imagine layers of fudgy chocolate brownies, crunchy Oreo cookies, gooey melted marshmallows, all crowned with a luscious, homemade chocolate fudge frosting. This isn’t just a dessert; it’s a dream come true for any chocolate lover, and surprisingly easy to make, even using a convenient boxed brownie mix!

These brownies are designed to satisfy the deepest chocolate cravings, offering a symphony of textures and flavors in every bite. The classic Mississippi Mud profile gets an irresistible upgrade with the addition of everyone’s favorite sandwich cookie, making these a truly unforgettable treat. Prepare to swoon over this delightful creation!

What Exactly Are Mississippi Mud Brownies?

The name “Mississippi Mud” evokes images of deep, rich, and often gooey chocolate desserts, much like the fertile, dark soil found along the Mississippi River. Traditionally, Mississippi Mud desserts feature a decadent chocolate base, often topped with marshmallows and a rich chocolate frosting or sauce. They are known for their intense chocolate flavor and delightful textural contrasts – usually a soft base, a chewy, sweet layer, and a smooth, creamy finish.

Our version of Mississippi Mud Brownies elevates this classic by incorporating several beloved elements: a deeply chocolatey brownie base, soft, melted marshmallows, and an easy-to-make, creamy fudge frosting. However, for an extra special twist, we’ve introduced Oreo cookies into the mix. Brownies and Oreos are a match made in heaven, adding a delightful crunch and an iconic chocolate-and-cream flavor that takes these brownies to an entirely new level. While the Oreos are a fantastic addition, the recipe is versatile enough that you can certainly omit them if you prefer the traditional version.

The Irresistible Layers of Flavor and Texture

These Mississippi Mud Oreo Brownies are designed to deliver an explosion of flavor and texture with every bite. The foundation is a remarkably moist and fudgy brownie, which we achieve with ease using a quality boxed mix, like Ghirardelli brownies. If you’re a purist or simply love baking from scratch, feel free to substitute with your favorite homemade fudgy chocolate brownie recipe. The key is a rich, dense brownie that can hold its own against the indulgent toppings.

What truly sets these brownies apart is the delightful crunch of Oreo cookies nestled within the brownie layers. This unexpected cookie surprise adds a wonderful textural contrast and an extra burst of chocolatey goodness. On top of this, a generous layer of marshmallows is added during the final minutes of baking, allowing them to soften and melt into a delightfully gooey, pillowy cloud. This marshmallow layer creates a sweet, stretchy transition between the brownie and the crowning glory: a simple yet incredibly delicious homemade chocolate fudge frosting.

The frosting is another star of this recipe. It’s incredibly easy to prepare on the stovetop, yielding a glossy, rich, and utterly decadent finish. Once the frosting is warm and smooth, it’s poured directly over the melted marshmallows, creating a beautiful, cohesive dessert. The most challenging part of this entire recipe is waiting for the frosting to set after it cools. That period of anticipation, knowing what deliciousness awaits, is almost as agonizing as it is rewarding!

Traditionally, pecans are often mixed into Mississippi Mud desserts for an earthy crunch. While we’ve omitted them here to cater to those who aren’t nut fans, if you adore the combination of chocolate and nuts, don’t hesitate to fold in a handful of chopped pecans or walnuts into your brownie batter or sprinkle them on top of the frosting. It’s a fantastic way to customize this already incredible treat.

Essential Ingredients for Your Mississippi Mud Oreo Brownies

Gathering your ingredients is the first step towards creating these magnificent brownies. You’ll find most of these staples in your pantry, making this a convenient recipe for an impromptu baking session or a planned celebration.

For the Oreo Brownies with Marshmallows:

1 Box Brownie Mix + Required Ingredients: Opt for a high-quality mix, such as Ghirardelli, for a wonderfully rich and fudgy base. Ensure it’s for a 9×9 inch pan.
12 Oreo Sandwich Cookies: The classic chocolate Oreos work perfectly, but don’t shy away from experimenting with different flavors like Pumpkin Spice, Mint, Brookie, Cookie Dough, or Peanut Butter Oreos for unique flavor profiles!
2 Cups Mini Marshmallows: Mini marshmallows are ideal as they melt evenly and create that signature gooey layer without being too bulky.

For the Rich Mississippi Mud Frosting:

⅓ Cup Unsalted Butter: Using unsalted butter allows you to control the overall saltiness of the frosting.
4 Tablespoons Milk of Choice: Whole milk offers the creamiest texture, but any milk will work.
2 Tablespoons Unsweetened Cocoa Powder: For deep chocolate flavor. Regular unsweetened cocoa or Special Dark Cocoa can be used depending on your preference for a richer, darker color and taste.
2 ¼ Cups Powdered Sugar: Sifted powdered sugar ensures a smooth, lump-free frosting.
1 Teaspoon Vanilla Extract: A crucial flavor enhancer that complements the chocolate beautifully.
1 Dash Salt: A pinch of salt balances the sweetness and brings out the chocolate flavor.
⅔ Cup Chopped Pecans or Walnuts (Optional): For those who love a nutty addition.

Step-by-Step Guide: Crafting Your Mississippi Mud Oreo Brownies

Part 1: Preparing the Oreo Brownies with Marshmallows

Prepare Your Pan: Preheat your oven to 325°F (160°C). Lightly spray a 9×9 inch baking pan with cooking spray. For effortless removal and clean slices, line the pan with parchment paper, leaving an overhang on two sides to act as “handles.”
Mix the Brownie Batter: Follow the instructions on your chosen brownie mix box to prepare the batter. Ensure all ingredients are well combined, but be careful not to overmix.
First Brownie Layer and Oreos: Pour about half of the brownie batter into the prepared pan, spreading it evenly. Arrange the Oreo cookies in a single layer over the batter. Don’t worry if they don’t perfectly cover every inch.
Second Brownie Layer: Carefully pour the remaining brownie batter over the Oreos, spreading it gently to cover them as much as possible. It’s okay if some Oreos peek through slightly.
Bake the Brownies: Bake the brownies according to the box instructions. A good indicator of doneness is when the center springs back lightly when pressed, or a toothpick inserted into the center (avoiding an Oreo) comes out with moist crumbs, but no wet batter.
Add the Marshmallows: Immediately after removing the brownies from the oven, sprinkle the mini marshmallows evenly over the hot surface. Return the pan to the oven for just 2-3 minutes, or until the marshmallows begin to puff up and look soft and melted. Keep a close eye on them to prevent burning.
Cool Slightly: Remove the brownies with their melted marshmallow topping from the oven and set them aside on a wire rack while you prepare the frosting.

Part 2: Crafting the Silky Mississippi Mud Frosting

Melt and Combine: In a medium saucepan, combine the unsalted butter, milk of your choice, and unsweetened cocoa powder over medium heat. Cook, stirring constantly, until the mixture begins to simmer. Let it simmer gently for 2-3 minutes, continuing to stir to prevent scorching and ensure all ingredients are well incorporated. This step deepens the chocolate flavor.
Whisk in Remaining Ingredients: Remove the saucepan from the heat. Whisk in the vanilla extract, sifted powdered sugar, and a dash of salt. Continue whisking until the frosting is completely smooth and free of lumps. For an extra velvety texture, you can use a hand mixer for this step.
Frost and Chill: While the frosting is still warm and pourable, carefully drizzle it evenly over the melted marshmallow layer on your brownies. Allow the brownies to cool completely at room temperature, then transfer them to the refrigerator to chill for at least 20-30 minutes. This chilling time is essential for the frosting to set properly, making the brownies easier to cut and enjoy.

Tips for Achieving the Perfect Mississippi Mud Oreo Brownies

Don’t Overbake Your Brownies: Overbaking can lead to dry brownies. The edges should be set, but the center should still be slightly soft when removed from the oven, especially since they’ll continue to cook slightly from residual heat.
Parchment Paper is Your Friend: Lining the pan with parchment paper is crucial for easy removal. Once chilled, you can lift the entire slab of brownies out of the pan and cut them on a flat surface.
Sift Your Powdered Sugar: For the smoothest frosting possible, always sift your powdered sugar. This prevents any tiny lumps from forming and ensures a truly silky texture.
Let it Chill: Patience is key! Resist the urge to cut into these brownies too soon. Allowing them to chill in the fridge for at least 20-30 minutes (or longer) helps the frosting set firmly, making for much cleaner cuts and a less messy, more enjoyable eating experience.
Cutting Techniques: For perfectly clean slices, use a sharp knife. For best results, run the knife under hot water and wipe it clean between each cut. This helps prevent sticking and dragging the frosting.
Storage: Store any leftover brownies in an airtight container at room temperature for up to 3 days, or in the refrigerator for up to a week. They are also freezer-friendly for longer storage (up to 3 months) – just thaw at room temperature before serving.

Variations and Customizations for Your Brownies

While the classic Mississippi Mud Oreo Brownies are a showstopper on their own, don’t hesitate to get creative with variations:

Different Oreo Flavors: As mentioned, try different Oreo varieties like mint, peanut butter, or even seasonal flavors to match the occasion.
Add Nuts: If you love a nutty crunch, fold ½ to ⅔ cup of chopped pecans or walnuts into your brownie batter, or sprinkle them over the warm frosting for a classic Mississippi Mud touch.
Spice it Up: A pinch of cayenne pepper in the brownie batter or frosting can add a subtle, intriguing heat, creating a “Mexican Hot Chocolate” vibe.
Coffee Enhancement: Add a teaspoon of instant espresso powder to the brownie batter or frosting to deepen the chocolate flavor without making it taste like coffee.
Chocolate Chips: Stir in a handful of chocolate chips (milk, dark, or white) into the brownie batter for extra pockets of melted chocolate.
Garnish: Before the frosting sets, sprinkle with additional mini marshmallows, crushed Oreos, chocolate shavings, or even a drizzle of caramel sauce for an extra touch of flair.

Why You’ll Fall in Love with These Mississippi Mud Oreo Brownies

I’m a self-proclaimed sucker for anything with marshmallows, and when you combine that gooey goodness with the irresistible crunch of Oreo cookies stuffed inside, topped with an ooey, gooey, rich fudge frosting – O.M.G.! It’s pure indulgence, a dessert that speaks directly to the soul of every chocolate enthusiast. If you find yourself drawn to the campfire flavors of s’mores, you’ll absolutely adore the similar, yet distinctly fudgier, experience of these brownies. They offer a comforting, deeply satisfying treat that hits all the right notes.

These Mississippi Mud Oreo Brownies are an absolute “bomb” of flavor and incredibly simple to whip up, making them perfect for any party, special event, or simply as a well-deserved treat for yourself. They are guaranteed to impress everyone who takes a bite, becoming an instant favorite and a go-to recipe for when you need a dessert that’s both easy and spectacularly delicious. Get ready to embark on a seriously decadent chocolate adventure!

More Delicious Chocolate Dessert Recipes to Explore

If these brownies have ignited your passion for chocolate, you’re in luck! We have a treasure trove of other amazing chocolate creations that are just as irresistible. Dive into these delightful recipes:

10 Minute Chocolate Thin Mint Cookie Obsession Desserts
Chocolate Fudge Marshmallow Oreo Brownie Pie
Triple Chocolate Mint Brownies with White Chocolate Buttercream Frosting
Thin Mint & Andes Dark Chocolate Brownies!
M&M Marshmallow Bars
Andes Mint Chocolate Covered Graham Crackers
10 “Jackpot” Chocolate Mint Brownies for St. Paddy’s!
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Easy Brownie Truffles
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Rocky Road S’more Brownies

Mint Oreo Mississippi Mud Brownies

By Kim Lange

A truly decadent dessert featuring fudgy brownies layered with mint Oreo cookies and marshmallows, all topped with a rich, easy-to-make Mississippi fudge frosting. Perfect for satisfying any chocolate craving!

5 out of 5 stars from 1 vote

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Prep Time: 15 mins

Cook Time: 37 mins

Chill Time: 20 mins

Total Time: 1 hr 12 mins

Course: Dessert

Servings: 16 Servings

Ingredients

Oreo Brownies with Marshmallows

1 brownie mix + ingredients (for 9×9 pan size)
12 Oreo sandwich cookies
2 cups mini marshmallows

Mississippi Mud Frosting

⅓ cup unsalted Butter
4 Tablespoons milk
2 Tablespoons unsweetened Cocoa Powder
2 ¼ cups powdered sugar, sifted
1 teaspoon vanilla extract
1 dash salt
⅔ cup chopped pecans or walnuts (optional)

Instructions

Oreo Brownies with Marshmallows

Preheat the oven to 325°F (160°C). Spray a 9×9 inch pan with cooking spray and line with parchment paper for easy removal.
Prepare brownie batter according to box instructions.
Pour approximately half of the brownie mix into the prepared pan and arrange Oreo cookies on top in a single layer.
Add the remaining brownie batter on top of the Oreos, spreading it gently. It’s perfectly fine if the Oreos aren’t completely covered. Bake brownies according to box instructions or until the center springs back lightly when pressed, or a toothpick comes out clean.
Immediately after baking, add the mini marshmallows evenly over the top of the hot brownies and return to the oven for 2-3 minutes, just until the marshmallows begin to puff and melt.
Remove the brownies from the oven and set aside to cool slightly while you prepare the frosting.

Mississippi Mud Frosting

In a medium saucepan over medium heat, combine the butter, milk, and cocoa powder. Cook until simmering and simmer for 2-3 minutes, stirring constantly to prevent burning.
Remove the saucepan from the heat and whisk in the vanilla extract, sifted powdered sugar, and a dash of salt. Continue whisking until the frosting is nice and smooth. A hand mixer can be used for extra smoothness.
Drizzle the warm frosting evenly over the marshmallow-topped brownies. Allow the brownies to cool completely, then chill in the fridge for 20-30 minutes before serving to allow the frosting to set.

Keyword: brownies, chocolate, frosting, marshmallow, nuts, Oreos

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