Get ready to meet your new favorite dessert. These Fluffernutter Brownies are the perfect marriage of rich, fudgy chocolate brownies, creamy peanut butter, and gooey marshmallow fluff. Every bite is an explosion of decadent flavor and texture that will transport you straight back to childhood. We’ve crafted this recipe to be not only incredibly delicious but also completely foolproof, ensuring you get that gorgeous, Instagram-worthy swirl every single time. Forget boring brownies; it’s time to elevate your baking game.
Whether you’re making a treat for a party, a bake sale, or just a Tuesday night, these brownies are guaranteed to be a showstopper. Let’s dive in and make the best Fluffernutter Brownies you’ve ever had.
Why You’ll Love These Fluffernutter Brownies
There are so many reasons this recipe will become a staple in your kitchen. It’s the ultimate comfort dessert that hits all the right notes.
- Perfectly Fudgy Texture: We use both melted chocolate and cocoa powder to create a brownie base that is intensely chocolatey, moist, and wonderfully fudgy, never cakey.
- The Irresistible Swirl: The combination of salty, creamy peanut butter and sweet, gooey Marshmallow Fluff creates the classic “Fluffernutter” flavor that is simply divine.
- Easy to Make: The steps are straightforward and simple to follow, making this an excellent recipe for bakers of all skill levels. You don’t need any special equipment to achieve stunning results.
- Visually Stunning: The beautiful swirls of white and tan against the dark chocolate brownie make this dessert a true work of art. It looks as amazing as it tastes!
What Are Fluffernutter Brownies?
A “Fluffernutter” is a classic American sandwich made with peanut butter and Marshmallow Fluff on white bread. These Fluffernutter Brownies take that iconic flavor combination and bake it into a rich, decadent brownie. A dense, chocolatey brownie batter is topped with dollops of peanut butter and marshmallow creme, then artfully swirled together before baking. The result is a multi-layered dessert with pockets of gooey marshmallow and creamy peanut butter in every single bite.
Ingredients for the Perfect Fluffernutter Brownies
Achieving the perfect balance of flavors starts with quality ingredients. Here’s what you’ll need to gather before you begin.
For the Brownie Batter
- Unsalted Butter: The foundation for a rich, fudgy texture.
- Semi-Sweet Chocolate Chips: Using melted chocolate chips creates a deeper chocolate flavor than cocoa powder alone.
- Granulated Sugar & Brown Sugar: This combination provides the perfect sweetness and contributes to the classic crackly top.
- Eggs: They act as a binder and give the brownies structure.
- All-Purpose Flour: Just enough to hold everything together without making the brownies cakey.
- Unsweetened Cocoa Powder: For an extra punch of deep chocolate flavor.
- Salt: Essential for balancing the sweetness.
For the Fluffernutter Swirl
- Creamy Peanut Butter: Use a standard commercial brand like Jif or Skippy for the best results, as natural peanut butters can separate.
- Marshmallow Fluff (or Crème): The star of the show! This provides the signature gooey, sweet marshmallow element.
How to Make Fluffernutter Brownies (Step-by-Step)
Follow these simple steps to create the most decadent brownies. We’ve broken it down to ensure a perfect bake every time.
- Prep Your Pan: First, preheat your oven to 350°F (175°C). Grease an 8×8 inch baking pan and line it with parchment paper, leaving an overhang on the sides to act as handles. This will make it much easier to lift the brownies out later.
- Melt Chocolate and Butter: In a microwave-safe bowl, melt the butter and 1 cup of the semi-sweet chocolate chips together. Heat in 30-second intervals, stirring in between, until smooth.
- Mix the Wet Ingredients: In a large bowl, whisk together the granulated sugar, brown sugar, and eggs until light and fluffy. Stir in the vanilla extract and the melted chocolate-butter mixture until well combined.
- Combine the Dry Ingredients: Add the all-purpose flour, cocoa powder, and salt to the wet ingredients. Fold them in gently with a spatula until just combined. Be careful not to overmix! Overmixing develops gluten and leads to tough, cakey brownies.
- Assemble the Brownies: Pour the brownie batter into your prepared pan and spread it into an even layer. In a separate small bowl, slightly warm the peanut butter in the microwave for about 15-20 seconds to make it easier to dollop. Drop spoonfuls of the peanut butter and marshmallow fluff alternately over the top of the batter.
- Create the Swirl: Use a butter knife or a skewer to gently swirl the peanut butter and marshmallow fluff into the brownie batter. A few figure-eight motions are all you need. Don’t overdo it, or the colors will become muddy.
- Bake to Perfection: Bake for 30-35 minutes, or until a toothpick inserted into the center (avoiding the marshmallow pockets) comes out with moist crumbs, but not wet batter. The edges should be set and pulling away from the sides of the pan.
- Cool Completely: This is the hardest part! Let the brownies cool completely in the pan before lifting them out and slicing. This ensures clean cuts and allows the brownies to set properly. For an even cleaner cut, try this technique from our pie crust guide—chilling the slab slightly before slicing.
Mastering the Swirl: Pro Tips for Success
The swirl is what makes these Fluffernutter Brownies so special. Here are a few expert tips to ensure yours looks and tastes incredible.
- Don’t Overmix the Swirl: Less is more. A few simple drags of a knife through the toppings is enough to create beautiful ribbons of color and flavor. Over-swirling will cause the marshmallow and peanut butter to blend into the batter.
- Warm the Peanut Butter: A quick 15 seconds in the microwave makes the peanut butter much softer and easier to dollop and swirl without disturbing the brownie batter underneath.
- Use Dollops, Not a Layer: Dropping separate spoonfuls of the marshmallow and peanut butter allows for distinct pockets of flavor, which is the hallmark of a great Fluffernutter brownie.
Recipe Variations to Try
While this classic recipe is a winner, it’s also a fantastic base for experimentation. If you love these, you might also enjoy our Chocolate Peanut Butter Marshmallow Cookies.
- Add Texture: For a bit of crunch, try using crunchy peanut butter or sprinkling a handful of chopped peanuts or extra chocolate chips over the top before baking.
- Salty & Sweet: A sprinkle of flaky sea salt on top after baking enhances the chocolate flavor and balances the sweetness of the marshmallow. It’s a simple touch that feels very gourmet, similar to our Salted Caramel Pretzel Cheesecake Balls.
- Different Chips: Feel free to swap the semi-sweet chocolate chips for milk chocolate, dark chocolate, or even peanut butter chips for a different flavor profile.
Storing Your Brownies
To keep your Fluffernutter Brownies fresh and delicious, store them in an airtight container at room temperature for up to 4 days. Due to the marshmallow, they can be a bit sticky, so placing a sheet of parchment paper between layers can prevent them from sticking together. We do not recommend refrigerating them, as it can dry out the brownie base.
Frequently Asked Questions About Fluffernutter Brownies
Yes, these brownies are great for making ahead. They store well in an airtight container at room temperature for up to 4 days. Their flavor and texture are just as delicious on day two!
Absolutely! To save time, you can use your favorite boxed brownie mix. Prepare the batter as directed on the box, then proceed with adding the peanut butter and marshmallow fluff swirl on top before baking.
The key is to not over-swirl. Drop dollops of fluff on top of the batter and use a knife to make just a few gentle figure-eight motions. This keeps the fluff in distinct pockets, preventing it from fully melting into the brownie.
Bake until a toothpick inserted into a chocolatey part of the brownie (not a marshmallow pocket) comes out with moist, fudgy crumbs attached, but not wet batter. The edges should be set and slightly pulled away from the pan.
For best results, use a standard commercial creamy peanut butter like Jif or Skippy. Natural peanut butters tend to separate when baked, which can result in an oily texture.
The Ultimate Fudgy Fluffernutter Brownies Recipe
Fluffernutter Brownies: The Ultimate Fudgy Swirl Recipe
Ingredients
Equipment
Method
- Preheat oven to 350°F (175°C). Grease and line an 8x8 inch baking pan with parchment paper, leaving an overhang on the sides.
- In a microwave-safe bowl, melt the butter and 1/2 cup of the semi-sweet chocolate chips together in 30-second intervals, stirring until smooth.
- In a large bowl, whisk together the granulated sugar, brown sugar, and eggs until light and fluffy. Stir in the vanilla extract and the melted chocolate mixture.
- Add the flour, cocoa powder, and salt. Fold gently with a spatula until just combined. Do not overmix. Stir in the remaining 1/2 cup of chocolate chips.
- Pour the batter into the prepared pan. Warm the peanut butter for 15-20 seconds in the microwave. Drop alternating spoonfuls of peanut butter and marshmallow fluff over the batter.
- Use a knife to gently swirl the toppings through the batter. A few figure-eight motions is sufficient. Do not overmix the swirl.
- Bake for 30-35 minutes, or until a toothpick inserted into the center (avoiding marshmallow) comes out with moist crumbs attached.
- Let the brownies cool completely in the pan on a wire rack before lifting them out with the parchment paper handles and slicing.
Notes
Tip 2: Use a standard commercial creamy peanut butter like Jif or Skippy. Natural peanut butter can separate when baked and affect the texture.
Tip 3: Don't overbake! The key to a fudgy brownie is to pull it from the oven when it's just slightly underdone in the very center.
Save This Recipe for Later!
We know you’re going to fall in love with these incredible Fluffernutter Brownies. They are the perfect treat for any occasion and are sure to impress friends and family. If you make them, please leave a comment below and let us know how they turned out! For more delicious dessert ideas, be sure to follow us on Pinterest.
