If you adore the irresistible combo of peanut butter and marshmallow nestled into decadent chocolate, these Fluffernutter Brownies will absolutely steal your heart! Imagine rich, fudgy brownies marbled with creamy peanut butter and swirls of fluffy marshmallow for a treat that’s gooey, nostalgic, and impossible to resist. With just a handful of pantry staples, this recipe promises maximum flavor with minimum fuss—no fancy equipment or complicated techniques required. Perfect for bake sales, family gatherings, or late-night cravings, Fluffernutter Brownies are the sweet upgrade your dessert lineup has been waiting for!

Fluffernutter Brownies Recipe - Recipe Image

Ingredients You’ll Need

Let’s talk ingredients! Each element of these Fluffernutter Brownies plays a starring role in creating that dreamy balance of chocolate, peanut butter, and marshmallow. There’s nothing fancy here—just simple kitchen staples that build big-time flavor and gorgeous texture in every square.

Melted unsalted butter: Adds unbeatable richness and keeps the brownies moist.
Granulated sugar: Sweetens and adds structure to the brownies.
Large eggs: Bring everything together, making the brownies chewy and delicious.
Vanilla extract: Enhances the chocolate flavor and adds warmth.
Unsweetened cocoa powder: The key to that deep, chocolaty base.
All-purpose flour: Just a bit for the perfect brownie texture—dense but not heavy.
Salt: A pinch brightens all the other flavors and balances sweetness.
Baking powder: Just enough to give the brownies a tender crumb.
Peanut butter: Creamy swirls add salty-sweet richness and plenty of nostalgia.
Marshmallow fluff: For those gooey, sticky swirls that make every bite exciting.

How to Make Fluffernutter Brownies

Step 1: Prep Your Pan and Oven

First things first: Set your oven to 350°F so it’s ready for action. Grab an 8×8-inch baking pan and line it with parchment paper for effortless brownie removal later. That parchment trick is a lifesaver for neat, Instagram-worthy squares.

Step 2: Mix the Brownie Batter

In a medium mixing bowl, whisk together the melted butter and sugar until the mixture looks smooth and glossy. Next, add the eggs and vanilla extract, giving everything a good whisk until combined. Sprinkle in the cocoa powder, flour, salt, and baking powder. Gently mix until you can’t see dry streaks, being careful not to overwork the batter—that keeps the brownies tender and fudgy.

Step 3: Pour and Swirl

Pour the brownie batter into your prepared pan and spread it evenly to the edges. Now comes the fun part: warm your peanut butter just enough to make it drizzle-ready (about 10 seconds in the microwave does the trick) and drop generous spoonfuls of peanut butter and marshmallow fluff all over the surface. Take a skewer or butter knife and gently swirl the two together—think big, dramatic loops, but try not to overmix for that standout marbled look.

Step 4: Bake to Perfection

Slide your pan into the oven and bake for 25 to 30 minutes. Keep an eye out for the telltale signs: the edges will pull away slightly from the pan, and a toothpick inserted near the center should come out with just a few moist crumbs. Resist the urge to overbake—this ensures your Fluffernutter Brownies stay gooey and luscious.

Step 5: Cool and Slice

Once they’re done, take the pan out and let the brownies cool completely. This step is worth the wait! Cutting too soon can make the swirls a sticky mess, so patience pays off. Once cool, lift them out using the parchment and slice into nine generous squares.

How to Serve Fluffernutter Brownies

Garnishes

Dress up your Fluffernutter Brownies with a pinch of flaky sea salt, a drizzle of extra melted peanut butter, or a handful of mini marshmallows. A dusting of cocoa powder or chopped roasted peanuts gives a lovely finishing touch, making each slice pop whether you’re serving to friends or indulging solo.

Side Dishes

These brownies are remarkable on their own, but pairing is fun, too! Try a scoop of vanilla or peanut butter ice cream, a hot mug of coffee, or a chilled glass of milk. If you’re planning a dessert spread, fresh berries and fruit salad cut the richness and add color to your table.

Creative Ways to Present

Cut your Fluffernutter Brownies into fun shapes with cookie cutters for parties, or stack mini squares in jars for sweet gifts. Sandwich two squares together with extra fluff or peanut butter for a double-decker treat, or break them up over an ice cream sundae for a decadent crunch.

Make Ahead and Storage

Storing Leftovers

Store your Fluffernutter Brownies in an airtight container at room temperature for up to three days. If you want to keep them extra gooey, tuck a slice of bread into the container—the brownies will soak up the moisture and stay soft.

Freezing

To freeze, arrange brownies in a single layer on a baking sheet and freeze until solid, then transfer to a freezer bag or airtight container with parchment between layers. They can be frozen for up to three months. This way, you can grab a square whenever a craving hits!

Reheating

Want to recreate that just-baked texture? Warm a brownie in the microwave for 10-15 seconds—just enough to make the fluff a little gooier and the peanut butter even creamier. It’s almost like freshly baked all over again.

FAQs

Can I use chunky peanut butter instead of creamy?

Absolutely! If you love some crunch in your Fluffernutter Brownies, go for chunky peanut butter. It adds a fun texture and extra nutty bites that contrast nicely with the marshmallow fluff.

Can I double the recipe for a larger batch?

Yes, simply double all the ingredients and use a 9×13-inch pan. Just keep in mind that the brownies may need a few extra minutes in the oven, so start checking for doneness around the 30-minute mark.

What’s the best way to get neat brownie squares?

For the cleanest cuts, make sure your Fluffernutter Brownies are fully cooled or even slightly chilled. Use a sharp knife, and wipe it clean between slices for picture-perfect squares every time.

Is there a way to make these gluten-free?

You can substitute your favorite 1:1 gluten-free all-purpose flour blend for the regular flour, and the results are still chewy and delicious. Everything else in the recipe is naturally gluten-free!

Can I add chocolate chips to the batter?

Definitely! Stir in up to half a cup of chocolate chips for extra bursts of chocolate in every bite. They’ll melt through the brownies and pair perfectly with the peanut butter and fluff swirls.

Final Thoughts

If you’re looking to dazzle your taste buds and spread a bit of joy, Fluffernutter Brownies are a must-try. There’s something magical about fudgy chocolate, gooey marshmallow, and creamy peanut butter all in one square. Whether you bake them for a crowd or just for yourself, these brownies might just become your new favorite treat!

Fluffernutter Brownies Recipe