Name: Fluffernutter Brownies Recipe
Prep time: 20 min
Cook time: 30 min
Total time: 50 min
Cuisine: American
Ingredients: 1 ⅓ cups (167.3 g) regular unsweetened cocoa powder; 1 cup (125 g) all-purpose flour; 1 teaspoon baking powder; ½ teaspoon kosher salt; 1 teaspoon espresso powder; 1 cup (2 sticks / 227 g) unsalted butter, room temperature; 2 cups (400 g) granulated sugar; 1 cup (168 g) semi-sweet chocolate chips; 1 tablespoon vanilla extract; 4 large eggs, room temperature; ¾ cup (193.5 g) creamy peanut butter; 1 cup (96 g) marshmallow fluff

Jump to Recipe· 4.2 from 73 reviews

If you are craving a rich, chocolatey dessert with a playful twist, this Fluffernutter Brownies Recipe is your new best friend in the kitchen. Combining the fudgy depth of cocoa with the nostalgic sweetness of peanut butter and marshmallow fluff, these brownies deliver a sensational harmony of flavors and textures that will have everyone asking for seconds. Whether you’re making a batch for a family gathering or just treating yourself, these brownies are irresistibly delightful and incredibly easy to whip up.

Ingredients You’ll Need

The image shows a sequence of four white rectangular baking dishes on a white marbled surface. In the first dish, there is a thick, dark brown chocolate batter spread unevenly as the bottom layer. The second dish has the same dark layer at the bottom, now topped with a smooth, light brown peanut butter layer spread evenly across it. The third dish shows the dark chocolate base with the peanut butter layer underneath and a thick white zigzag line of creamy frosting or marshmallow spread on top of the peanut butter. The fourth dish displays a smooth, thick layer of dark chocolate batter completely covering the peanut butter and white layer underneath, forming a uniform dark top surface. Photo taken with an iphone --ar 4:5 --v 7

These ingredients are simple pantry staples that come together to create the perfect balance of decadent chocolate and creamy peanut butter, with a fluffy marshmallow surprise. Each element plays an essential role in crafting a brownie that’s rich, moist, and irresistibly gooey in the middle.

Regular unsweetened cocoa powder (1 ⅓ cups / 167.3 g): This packs the intense chocolate flavor and rich color that defines the brownie base.
All-purpose flour (1 cup / 125 g): The structure provider, helping the brownies hold their fudgy texture without being cakey.
Baking powder (1 teaspoon): Gives a slight lift to prevent the brownies from becoming too dense.
Kosher salt (½ teaspoon): Enhances all the sweet and chocolate flavors perfectly.
Espresso powder (1 teaspoon): A secret ingredient to elevate the chocolate’s depth without tasting like coffee.
Unsalted butter (1 cup / 2 sticks / 227 g): Adds richness and a tender crumb, melted to blend smoothly with sugar and chocolate.
Granulated sugar (2 cups / 400 g): The sweetness that balances the cocoa’s bitterness.
Semi-sweet chocolate chips (1 cup / 168 g): Melted into the batter for smooth chocolate silkiness and occasional bursts of gooey chocolate.
Vanilla extract (1 tablespoon): Rounds out the flavors with a mellow aromatic touch.
Large eggs, room temperature (4): They bind the ingredients together and contribute to that fudgy texture.
Creamy peanut butter (¾ cup / 193.5 g): Rich and nutty, this layer brings the signature “Fluffernutter” flavor to the brownies.
Marshmallow fluff (1 cup / 96 g): Creates the luscious, sweet, and airy swirls that sandwich the peanut butter layer.

How to Make Fluffernutter Brownies Recipe

Step 1: Preheat and Prep

Set your oven to 350°F and line a 9×13-inch ceramic baking dish with parchment paper. This ensures the brownies don’t stick and slide out easily once baked.

Step 2: Mix the Dry Ingredients

In a large bowl, whisk together the cocoa powder, all-purpose flour, baking powder, kosher salt, and espresso powder. This combination of dry ingredients creates the foundation for your rich, fudgy brownies.

Step 3: Melt Butter and Sugar

In a sturdy saucepan over medium heat, melt the butter and add the granulated sugar. Let it come to a low boil and maintain it for about 2 minutes while stirring occasionally. This step is crucial for developing that deep caramelized flavor in your brownie.

Step 4: Incorporate Chocolate and Vanilla

Remove the saucepan from the heat and immediately stir in the semi-sweet chocolate chips and vanilla extract until fully melted. Your mixture might look a bit grainy — that’s totally normal. Allow it to cool for roughly 10 minutes, so the eggs won’t cook when added later.

Step 5: Add Eggs

Add the eggs one at a time to the chocolate mixture, stirring constantly to create a smooth, glossy batter. This step is what gives your brownies a velvety texture.

Step 6: Combine Dry and Wet

Gently fold the dry ingredient mixture into the chocolate batter until just combined. The batter will be thick and luscious, the perfect consistency for creating layers.

Step 7: Assemble Layers

Spoon half of the batter evenly into the lined baking dish and spread it smooth. Then dollop and spread the creamy peanut butter over the brownie base. Next, pipe or dollop marshmallow fluff over the peanut butter layer, creating fluffy white clouds that promise sweet surprises. Finish by spreading the remaining brownie batter on top in an even layer.

Step 8: Bake to Perfection

Bake the assembled brownies for 28 to 30 minutes, until the edges are set but the center still looks fudgy. Let the brownies cool completely to allow the layers to set perfectly before slicing into squares.

How to Serve Fluffernutter Brownies Recipe

The image shows a stack of three brownies on a white marbled surface. Each brownie has three visible layers: a dark brown cracked top layer with a rough, cracked texture; a middle layer with white, fluffy marshmallow patches unevenly spread; and a bottom layer that shows a caramel-colored filling resting on a dense, dark brown base. The brownies are square-shaped with slightly uneven edges. Photo taken with an iphone --ar 4:5 --v 7

Garnishes

Sprinkle a light dusting of powdered sugar or add a few mini marshmallows on top for extra whimsy and texture. A drizzle of melted peanut butter or fudge sauce can also amp up the peanut-chocolate appeal for serving.

Side Dishes

These brownies shine with a scoop of vanilla ice cream or a dollop of whipped cream. Fresh berries or a drizzle of raspberry coulis can add a lively fruit contrast that cuts through the richness.

Creative Ways to Present

Transform this Fluffernutter Brownies Recipe into elegant dessert bars by cutting them into bite-sized squares and serving on decorative trays at a party. You can also layer brownie chunks in a trifle with whipped cream and banana slices for a playful twist on a classic dessert.

Make Ahead and Storage

Storing Leftovers

Store any leftover brownies in an airtight container at room temperature for up to 3 days to keep their chewy, fudgy texture. For longer freshness, refrigeration helps but might slightly firm up the marshmallow layer.

Freezing

Wrap brownies tightly in plastic wrap and place them in a freezer-safe container or bag. Frozen brownies stay delicious for up to 3 months. Thaw them at room temperature when ready to eat for the best texture.

Reheating

Warm brownies gently in the microwave for 10 to 15 seconds to bring back their soft, gooey goodness. Avoid overheating, which can harden the marshmallow fluff layer and dry out the peanut butter.

FAQs

Can I use natural peanut butter instead of creamy?

Yes, you can substitute natural peanut butter, but it may be a bit looser or oilier, which could slightly affect the texture of the peanut butter layer. Stir well before spreading for best results.

Is it possible to make these brownies gluten-free?

Absolutely! Swap out the all-purpose flour for a gluten-free flour blend that measures 1:1 in baking. Just make sure your cocoa powder and other ingredients are gluten-free as well.

Can I make mini Fluffernutter brownies in a muffin pan?

Definitely! Adjust the baking time to about 18 to 20 minutes and keep an eye on them to avoid overbaking. They make fun, portable treats perfect for parties or school snacks.

Why is espresso powder included in the recipe?

Espresso powder enhances the chocolate flavor without adding a coffee taste. It intensifies the richness and depth, making the chocolate notes more vibrant and complex.

Can I substitute marshmallow fluff with marshmallows?

You can, but the texture will be different. Mini marshmallows will melt and create a gooey layer rather than the smooth, spreadable fluff swirl. For the classic look and texture, marshmallow fluff is recommended.

Final Thoughts

If you’re ready to indulge in a brownie that’s truly next-level, the Fluffernutter Brownies Recipe is calling your name. Its delightful layers of chocolate, peanut butter, and marshmallow fluff come together in perfect harmony to create a treat that’s comforting, nostalgic, and absolutely crave-worthy. Dive in, share with your loved ones, and enjoy every gooey, chocolaty bite. Trust me, once you try this recipe, it will hold a special place in your dessert rotation forever.