Are you in for a very decadent, rich chocolate Oreo Marshmallow brownie dessert for your chocolate cravings? These Mississippi Mud Oreo Brownies are the answer to your heavenly dreams! These sinful brownies are so easy-to-make, using a boxed brownie mix!
Then Oreo sandwich cookies are layered inside the brownies, then topped with marshmallows and a simple, delicious gooey chocolate fudge frosting! Swooning so hard right now! Check out 20 St. Patrick's Day Desserts!
What Are Mississippi Mud Brownies?
It's no wonder I'm swooning! Mississippi Mud Brownies are a delicious combination of chocolate brownies, easy, creamy chocolate frosting, and melted marshmallows! However, in this recipe we added Oreos, because brownies and Oreos are so good together, but you can certainly leave them out.
These Mississippi Mud Brownies are the moistest, fudgiest, marshmallow-topped brownies that will rock your world, with Oreos included for a crunchy cookie surprise inside!!
We used a box mix of Ghirardelli brownies
Speaking of the frosting, is is just another component of this recipe that makes these brownies so amazing! It's easy to make on the stove-top and once it's done, you just pour it on top of the marshmallows!
Because the frosting is hot, you have to let it cool so the frosting sets. That's the hardest part...waiting for everything to set, so you can cut into the brownies! Then devour!
Pecans are usually added in the mix, but since my daughter isn't a 'nut' fan, I left them, but if you're an avid fan of nuts, by all means add them in!
Ingredients You Need for Mississippi Mud Brownies
Oreo Brownies with Marshmallows
- 1 brownie mix + ingredients, included for 9x9 pan size, I love Ghirardelli's Brownie Mixes
!
- Oreo sandwich cookies or any flavor you want to use like pumpkin
, mint
, brookie cookie dough
or peanut butter Oreos
.
- mini marshmallows
Mississippi Mud Frosting
- unsalted butter
- milk of choice
- unsweetened cocoa powder
or Special Dark Cocoa
- powdered sugar
- vanilla extract
- salt
- chopped pecans or walnuts, optional
How to Make Mississippi Mud Oreo Brownies
Oreo Brownies with Marshmallows
- Preheat the oven to 325°. Spray a 9×9 pan with cooking spray and set aside. Line with parchment paper for easy removal.
- Make Ghirardelli brownies according to box instructions.
- Pour some of the brownie mix into the pan and layer Oreo cookies on top.
- Add remainder of brownie mix on top of brownies. It’s ok if the Oreos aren’t completely covered. Bake brownies according to box instructions or until
- until the center of the cake springs back lightly when pressed on, or a toothpick comes out clean.
- Immediately add the marshmallows over the top of the brownies and return to the oven. Bake for 2-3 minutes, just until the marshmallows are starting to puff and melt.
- Remove the brownies from the oven and set aside to make 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, being sure to stir constantly.
- Remove from the heat and whisk in the vanilla and powdered sugar. You can use a hand mixer to get the frosting nice and smooth if you would like.
- Drizzle the warm frosting over the brownies and allow to chill in the fridge for 20-30 minutes before serving.
I'm a sucker for marshmallow anything, and with those yummy Oreo cookies stuffed inside and the ooey, gooey, fudgy frosting O.M.G.!! Mercy me! If you love s'mores, you may love these Rocky Road S'more Brownies 🙂
These Mississippi Mud Brownies are the bomb and super-easy to whip up for any kind of party or special event! These are the perfect brownies to impress everyone!
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Mint Oreo Mississippi Mud Brownies
Ingredients
Oreo Brownies with Marshmallows
- 1 brownie mix + ingredients included for 9x9 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°. Spray a 9×9 pan with cooking spray and set aside. Line with parchment paper for easy removal.
- Make brownies according to box instructions.
- Pour some of the brownie mix into the pan and layer Oreo cookies on top.
- Add remainder of brownie mix on top of brownies. It’s ok if the Oreos aren’t completely covered. Bake brownies according to box instructions or until
- until the center of the cake springs back lightly when pressed on, or a toothpick comes out clean.
- Immediately add the marshmallows over the top of the brownies and return to the oven. Bake for 2-3 minutes, just until the marshmallows are starting to puff and melt.
- Remove the brownies from the oven and set aside to make 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.
- Remove from the heat and whisk in the vanilla and powdered sugar. You can use a hand mixer to get the frosting nice and smooth if you would like.
- Drizzle the warm frosting over the brownies and allow to chill in the fridge for 20-30 minutes before serving.
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