If you adore rich chocolate brownies with a gooey, nostalgic twist, you are in for an absolute treat with this Fluffernutter Brownies Recipe. Picture fudgy brownies swirled with creamy peanut butter and fluffy marshmallow goodness, creating a dessert that feels like a cozy hug on a plate. This recipe is a delightful combination that transforms a classic brownie into something utterly memorable and irresistibly delicious. Once you try these, you’ll find yourself reaching for this Fluffernutter Brownies Recipe again and again.

Ingredients You’ll Need
The beauty of this Fluffernutter Brownies Recipe lies in its simplicity. Each ingredient plays a vital role in building that perfect balance of fudgy texture, deep chocolate flavor, and the classic sweet peanut butter and marshmallow swirls that make this dessert so special.
- Unsalted butter (1 cup): Gives the brownies a rich, moist base and perfect fudgy texture.
- Granulated sugar (1 cup): Adds sweetness and helps create that crackly brownie top we all love.
- Brown sugar (1 cup): Provides a subtle molasses flavor and extra chewiness.
- Large eggs (3): Bind everything together and add moisture for that classic brownie density.
- Vanilla extract (2 teaspoons): Enhances all other flavors and adds warmth to the batter.
- All-purpose flour (1 cup): The structure provider that keeps your brownies tender yet sturdy.
- Unsweetened cocoa powder (1 cup): Delivers deep, chocolatey richness that’s the heart of these brownies.
- Salt (1/2 teaspoon): Balances sweetness and enhances the chocolate taste.
- Marshmallow fluff (3/4 cup): Adds the signature sweet, marshmallow swirls essential to the Fluffernutter Brownies Recipe.
- Creamy peanut butter (3/4 cup): Brings that smooth, nutty dimension, creating the famous fluffernutter combo.
- Chocolate chips or chunks (1/2 cup, optional): For extra melty chocolate bursts to intensify every bite.
How to Make Fluffernutter Brownies Recipe
Step 1: Prepare Your Pan and Oven
Start by preheating your oven to 350°F (175°C) and lining an 8×8-inch baking pan with parchment paper. This will prevent sticking and make clean removal a breeze once your brownies are baked and cooled.
Step 2: Melt Butter and Mix Sugars
Melt the unsalted butter gently in a saucepan or microwave-safe bowl, then let it cool just a little. Once slightly cooled, whisk in both granulated and brown sugars until the mixture becomes smooth and glossy. This combination promises both sweetness and that subtle caramel note that browns when baked.
Step 3: Incorporate Eggs and Vanilla
Next up, add your eggs and vanilla extract to the buttery sugar mix. Whisk it all together until the batter looks glossy and starts to thicken slightly. This step is crucial for an even texture and helps your brownies rise just enough.
Step 4: Add Dry Ingredients
Gently stir in the all-purpose flour, cocoa powder, and salt. Make sure to mix until just combined — overmixing can make the brownies tough, so be gentle here to keep everything tender and fudgy.
Step 5: Layer the Batter and Swirl Fluffernutter
Pour half of the brownie batter into your prepared pan. Then, dollop spoonfuls of creamy peanut butter and marshmallow fluff across the surface. Using a knife or skewer, swirl these layers gently to create those beautiful, gooey pockets you’re aiming for. Pour the remaining chocolate batter on top and repeat the swirling process if you want an even richer effect.
Step 6: Bake to Perfection
Bake your brownies for 28 to 32 minutes. You’ll know they’re done when a toothpick inserted into the center comes out with a few moist crumbs attached — you don’t want it completely clean because that means your brownies might dry out.
Step 7: Cool and Slice
After removing from the oven, allow your brownies to cool completely in the pan before slicing. This step is key to getting clean cuts and letting those luscious layers set beautifully.
How to Serve Fluffernutter Brownies Recipe
Garnishes
Sprinkle a light dusting of powdered sugar or cocoa powder over the brownies for an elegant look. You can also add chopped peanuts or a drizzle of melted chocolate on top to elevate the peanut butter flavor and add a bit of crunch.
Side Dishes
A scoop of vanilla ice cream or a dollop of whipped cream pairs wonderfully with these brownies, balancing the rich chocolate and sweet fluffernutter swirls. Fresh berries or sliced bananas make refreshing accompaniments, adding a pop of color and brightness.
Creative Ways to Present
Try presenting your Fluffernutter Brownies Recipe as bite-sized squares on a festive platter for parties, or serve warm with a tiny spoon to savor every gooey swirl. Layering them in a parfait glass with whipped cream and crushed peanuts is a fun twist for dessert lovers who enjoy appearance as much as taste.
Make Ahead and Storage
Storing Leftovers
Store leftover brownies in an airtight container at room temperature for up to 3 days. If your kitchen is warm, moving them to the fridge will keep the marshmallow and peanut butter swirls firmer and fresher for an extra day or two.
Freezing
Your Fluffernutter Brownies Recipe freezes beautifully. Wrap tightly in plastic wrap, then place in a freezer bag or container for up to 3 months. When ready, thaw overnight in the fridge for the best texture and flavor.
Reheating
If you want to enjoy warm brownies, pop slices in the microwave for about 10-15 seconds. This helps the peanut butter and marshmallow soften delightfully, bringing back that freshly baked feeling.
FAQs
Can I use crunchy peanut butter instead of creamy?
Absolutely! Crunchy peanut butter will add a lovely texture contrast in each bite, making the Fluffernutter Brownies Recipe even more interesting with little peanut bites.
Is marshmallow fluff necessary, or can I substitute it?
Marshmallow fluff gives the classic sweet, light, and sticky texture, but you can swap it for mini marshmallows melted into the batter or marshmallow creme if needed. Just keep in mind the consistency might differ slightly.
Can I make this recipe gluten-free?
Definitely! Substitute the all-purpose flour with a good quality gluten-free baking blend. Your brownies will still be fudgy and delicious, although the texture might be a little different depending on the blend used.
What type of cocoa powder works best?
Use unsweetened natural cocoa powder for that deep chocolate richness which contrasts wonderfully with the sweet marshmallow and peanut butter. Avoid Dutch-processed unless adjusting leavening agents, since it’s less acidic.
Can I double the recipe for a larger pan?
You sure can. Just double all ingredients and use a 9×13-inch pan for even thickness. The baking time might increase slightly, so keep an eye on the brownies after 35 minutes.
Final Thoughts
If you’re looking to impress your family, friends, or simply indulge yourself, the Fluffernutter Brownies Recipe is an undeniable winner. It’s a nostalgic, joyful mix of textures and flavors that feels like a comforting celebration every time. I can’t wait for you to give this recipe a go and enjoy every gooey, chocolatey bite just as much as I do!
Print
Delicious Recipe
- Prep Time: 10 minutes
- Cook Time: 30 minutes
- Total Time: 40 minutes
- Yield: 16 servings
- Category: Dessert
- Method: Baking
- Cuisine: American
- Diet: Vegetarian
Description
Indulge in these rich and gooey Fluffernutter Brownies that combine classic chocolate brownie goodness with creamy marshmallow fluff and peanut butter swirls for a nostalgic twist. Perfect for dessert or anytime sweet cravings hit.
Ingredients
Brownie Batter
- 1 cup unsalted butter
- 1 cup granulated sugar
- 1 cup brown sugar
- 3 large eggs
- 2 teaspoons vanilla extract
- 1 cup all-purpose flour
- 1 cup unsweetened cocoa powder
- 1/2 teaspoon salt
Swirl Toppings
- 3/4 cup marshmallow fluff
- 3/4 cup creamy peanut butter
- 1/2 cup chocolate chips or chunks (optional)
Instructions
- Prepare Oven and Pan: Preheat your oven to 350°F (175°C) and line an 8×8-inch baking pan with parchment paper for easy removal of the brownies.
- Melt Butter: Melt the butter in a saucepan over low heat or in a microwave-safe bowl, then let it cool slightly so it won’t cook the eggs when added.
- Mix Sugars: Whisk together the granulated sugar and brown sugar into the melted butter until the mixture is smooth and well combined.
- Add Eggs and Vanilla: Incorporate the eggs and vanilla extract into the sugar-butter mixture, mixing until the batter becomes glossy and slightly thickened.
- Combine Dry Ingredients: Gently stir in the unsweetened cocoa powder, all-purpose flour, and salt until just combined; avoid overmixing to maintain tender brownies.
- Assemble Brownies: Pour half of the brownie batter into the prepared pan evenly.
- Add Swirl Toppings: Drop spoonfuls of the peanut butter and marshmallow fluff over the batter surface.
- Create Swirls: Using a knife or skewer, gently swirl the peanut butter and fluff into the batter for a marbled effect.
- Add Remaining Batter and Swirls: Pour the remaining brownie batter over the first layer, and if desired, repeat the addition and swirling of peanut butter and fluff on top.
- Bake: Place the pan in the preheated oven and bake for 28–32 minutes or until a toothpick inserted near the center comes out with a few moist crumbs.
- Cool and Serve: Remove the brownies from the oven and allow them to cool completely in the pan before slicing and serving to ensure clean cuts and stable swirls.
Notes
- Do not overmix the batter to keep brownies tender and fudgy.
- Line the baking pan with parchment paper for easy removal and clean edges.
- Optional chocolate chips can be added for extra texture and chocolate flavor.
- Make sure the butter is slightly cooled before mixing to avoid cooking the eggs prematurely.
- Swirling the peanut butter and marshmallow fluff lightly creates a beautiful marbled effect but avoid over-swiping to keep distinct layers.
- Store brownies in an airtight container at room temperature for up to 3 days or refrigerate for up to a week.

