Fluffernutter Brownies

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If you’re a fan of peanut butter and marshmallow together, these Fluffernutter Brownies are pure magic. Rich, fudgy brownie base meets swirls of gooey marshmallow fluff and creamy peanut butter—each bite balancing dense chocolate with sweet nuttiness.

What I love most is how they bring together childhood nostalgia and grown-up indulgence. The combination of textures—from chewy center to crispy, caramelized edges—makes these brownies impossible to resist.

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What Sets This Fluffernutter Brownies Recipe Apart

You know how some brownies are too sweet or too cakey? Not these. The base is deeply fudgy and chocolate-forward without being overwhelming. Adding peanut butter gives it a salty creaminess, and the ribbons of marshmallow fluff stay soft and stretchy even after baking.

The brownie batter is rich with cocoa and butter, and instead of mixing the peanut butter and fluff in, I swirl them into the top—which not only makes a beautiful marbled look, but also ensures the flavors stay distinct.

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The Ingredients That Make These Fluffernutter Brownies Work

Every ingredient plays a role in why these brownies deliver big-time flavor and texture.

• Unsalted Butter: The base of any good brownie starts here—rich, creamy, and allows you to control salt levels.
• Granulated Sugar: Sweetens the brownie and helps create that crinkly top.
• Brown Sugar: Adds depth and a hint of molasses.
• Eggs: Give the structure and chew.
• Vanilla Extract: Balances the richness with warmth.
• All-Purpose Flour: Just enough to bind, but not too much to make them cakey.
• Unsweetened Cocoa Powder: For that deep, dark chocolate punch.
• Salt: Essential to enhance every other flavor.
• Marshmallow Fluff: Not mini marshmallows—we want gooey, swirly magic here.
• Creamy Peanut Butter: Classic Skippy-style, not natural. The smoothness matters.

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How To Make the Fluffernutter Brownies

Step 1: Make the Brownie Base

Melt butter and whisk it with both sugars until smooth. Add eggs and vanilla, beat until thick and glossy. Fold in cocoa, flour, and salt until just combined—don’t overmix.

Step 2: Layer and Swirl

Pour the batter into a parchment-lined baking pan. Dollop spoonfuls of peanut butter and marshmallow fluff over the top. Use a knife to swirl them gently into the top layer of the brownie.

Step 3: Bake

Bake at 350°F (175°C) for about 28–32 minutes. The center should still be slightly soft. Let them cool completely before slicing—trust me.

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How I Serve and Store These Brownies

I like to serve them slightly warm, with a small scoop of vanilla ice cream or just a glass of cold milk. The marshmallow softens even more, and the peanut butter feels like a warm hug.

Over time, they do get denser—which I love. By day two, they’re even fudgier and more intense in flavor. If you want to revive that just-baked texture, pop a slice in the microwave for 8–10 seconds.

Storage: Keep them in an airtight container at room temperature for up to 4 days, or refrigerate for a fudgier texture. They also freeze beautifully—just wrap each square and store for up to 2 months.

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Why You’ll Love This Recipe

These Fluffernutter Brownies aren’t just brownies with stuff added—they’re thoughtfully balanced. You get that soft, rich chocolate base, pockets of peanut butter that melt on your tongue, and stretchy, sweet fluff that caramelizes at the edges.

Unlike other recipes that stir everything in, I swirl the toppings on top—so they bake into distinct layers. It looks better and tastes more dynamic. You don’t need fancy tools either—just a whisk, a bowl, and a knife for swirling.

They’re great for beginner bakers, and forgiving enough to tweak slightly depending on your sweet tooth.

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Want More Brownie and Bar Recipes?

If you love this kind of over-the-top, gooey treat, check these out too:

• Oatmeal Jam Bars for a fruity twist on texture.
• Pumpkin Coffee Cake with Cinnamon Streusel Crumble if you crave cozy spice.
• Red Velvet Cheesecake Brownies for something rich and tangy.
• Salted Caramel Cake That Melts in Your Mouth for pure indulgence.
• Donut Cake Tower if you want a showstopper at your next gathering.

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Before You Go, Pin and Comment Below

If these brownies made your kitchen smell like happiness, save them to your “Dessert Dreams” or “Peanut Butter Obsession” boards on Pinterest. I’d love to hear what you thought—did you try a crunchy peanut butter swirl? Did you sneak in some chocolate chips? Let me know below!

You can follow my daily baking experiments and flavor pairings over at Life With Mira—I post every cozy craving you can imagine.

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