If you’re a fan of the sweet nostalgia of peanut butter and marshmallow fluff, these Fluffernutter Brownies are about to become your new guilty pleasure. This dessert is every bit as rich and gooey as it sounds, combining the deep fudgy decadence of brownies with the creamy, salty sweetness of a fluffernutter sandwich.

Each bite is a perfect swirl of chocolate, peanut butter, and melted marshmallow that stretches like taffy. They’re messy in the best way, with ribbons of marshmallow fluff bubbling through golden-baked edges and soft, chewy centers. It’s a treat that feels indulgent, playful, and utterly unforgettable.

Why You’ll Love This Fluffernutter Brownies Recipe

These brownies offer the ultimate flavor mashup that hits all the right notes: salty, sweet, rich, and chewy. They come together easily with just a few pantry staples, making them perfect for weeknight baking or special occasions. If you like your brownies dense and packed with flavor, this recipe is going to be a favorite.

They also make excellent party tray additions, bake sale hits, or late-night indulgences. And the best part? You don’t need any fancy equipment or baking skills to make them look and taste bakery-level delicious.

What Kind of Marshmallow Should I Use?

Marshmallow fluff is essential here. It melts differently than regular marshmallows, creating beautiful ribbons throughout the brownie batter without completely disappearing. If you substitute with mini marshmallows, expect a different texture and appearance. Fluff ensures that signature sticky swirl we all love in a true fluffernutter combo.

Ingredients for the Fluffernutter Brownies

These brownies are all about combining pantry basics into a show-stopping dessert. Every ingredient has a purpose, from creating a rich base to delivering that ooey-gooey marshmallow swirl.

Butter
Granulated sugar
Brown sugar
Eggs
Vanilla extract
All-purpose flour
Cocoa powder
Salt
Creamy peanut butter
Marshmallow fluff

The butter gives your brownies that essential fudgy richness. Granulated sugar and brown sugar add structure and deep molasses flavor. Eggs help bind everything and add chewiness. Vanilla extract gives a warm aroma, while flour, cocoa powder, and salt form the classic chocolate brownie base.

Creamy peanut butter is used in swirls throughout the batter, bringing that salty-sweet balance. And of course, marshmallow fluff adds gooey ribbons and a nostalgic twist.

How To Make the Fluffernutter Brownies

Step 1: Prepare the Brownie Batter

Start by preheating your oven to 350°F and greasing a square 8×8 inch baking pan. In a saucepan or microwave, melt your butter, then mix it with the granulated and brown sugar until combined. Stir in the eggs and vanilla extract.

Add flour, cocoa powder, and salt to the wet ingredients, mixing just until smooth. Be careful not to overmix, or you’ll lose that fudgy texture.

Step 2: Swirl in the Good Stuff

Pour the brownie batter into the prepared pan and smooth it out. Drop spoonfuls of peanut butter and marshmallow fluff on top, spacing them evenly. Use a knife or skewer to gently swirl them through the batter, creating ribbons across the surface.

Step 3: Bake to Perfection

Bake for 28 to 32 minutes or until the edges are set and a toothpick inserted in the center comes out with just a few moist crumbs. Let them cool completely in the pan before slicing. The swirl may look a little wild, but that’s part of the charm!

How to Serve and Store Fluffernutter Brownies

These brownies are rich and satisfying, perfect for serving in small squares. One pan can easily feed 9 to 12 people, depending on how generous you want to be. They’re ideal on their own or with a scoop of vanilla ice cream for an extra treat.

To store, keep them in an airtight container at room temperature for up to 3 days. If you prefer a firmer texture, refrigerate them. You can also freeze individual pieces wrapped in plastic and foil for up to two months.

What to Serve With Fluffernutter Brownies?

A Glass of Cold Milk

Nothing beats a chilled glass of milk next to these rich, gooey brownies. It balances the sweetness perfectly.

Vanilla Ice Cream

The contrast of warm brownie and cold vanilla ice cream is just heavenly.

Hot Coffee

Pairing them with a strong cup of black coffee enhances the chocolate flavor and cuts through the richness.

Fresh Strawberries

The bright acidity of fresh strawberries makes for a refreshing side to the dense, sweet treat.

Peanut Butter Drizzle

Want to go all in? A light drizzle of warmed peanut butter over the top takes these brownies over the edge.

Chocolate Ganache

For a luxurious finish, add a thin layer of chocolate ganache on top once the brownies are cool.

Whipped Cream

A simple dollop of whipped cream gives a light, fluffy contrast to the chewy texture.

Want More Brownie Ideas with a Twist?

If these Fluffernutter Brownies made you smile, there are more creative takes you’ll want to try:

Cottage Cheese Protein Brownies for a high-protein, creamy indulgence.
Churro Cheesecake Donut Cookies with cinnamon-sugar crunch and creamy swirls.
Peanut Butter S’mores Sandwich Cookies that pack gooey and crunchy all in one.
Easter Cake Mix Cookie Bars for a fun, colorful twist on dessert bars.
Lemon Truffles if you love a tart-sweet treat that’s easy to pop and share.

Save This Recipe For Later

📌 Save this recipe to your Pinterest dessert board so you can come back to it any time.

And let me know in the comments how yours turned out. Did you go heavy on the peanut butter? Add extra marshmallow? I’m always curious how others make these recipes their own.

Explore beautifully curated health-boosting drinks and fun desserts on Janet Dishes on Pinterest and discover your new go-to for feeling great!

Conclusion

Fluffernutter Brownies are the kind of dessert that brings out everyone’s inner child. With a simple swirl of peanut butter and marshmallow fluff through rich, fudgy brownie batter, you get a dessert that’s a little messy, incredibly fun, and totally unforgettable. Whether it’s for a casual bake or an impressive dessert table, these bars are bound to get plenty of love.