Fluffernutter Bars

Fluffernutter Bars are a deliciously nostalgic dessert that combines the creamy richness of peanut butter with the gooey sweetness of marshmallow fluff. These bars are inspired by the classic fluffernutter sandwich and bring the same comforting flavor in a soft, chewy, and indulgent bar form. Perfect for potlucks, lunchboxes, or any time you need a sweet treat with a touch of childhood magic.

ingredients

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

all-purpose flour
baking powder
salt
unsalted butter
light brown sugar
granulated sugar
eggs
vanilla extract
creamy peanut butter
marshmallow fluff

directions

Preheat your oven to 350°F (175°C) and line a 9×13-inch baking pan with parchment paper.

In a medium bowl, whisk together the flour, baking powder, and salt.

In a large bowl, cream the butter, brown sugar, and granulated sugar until light and fluffy.

Add the eggs and vanilla extract to the butter mixture, beating well to combine.

Stir in the peanut butter until smooth and fully incorporated.

Gradually add the dry ingredients to the wet mixture, mixing just until combined.

Spread two-thirds of the dough into the prepared baking pan, smoothing it into an even layer.

Carefully spread the marshmallow fluff over the dough layer. It helps to slightly warm the fluff or use a wet spatula for easier spreading.

Drop the remaining dough in small spoonfuls over the marshmallow layer, lightly spreading to cover most of it.

Bake for 25–30 minutes or until the top is golden brown and set.

Allow the bars to cool completely in the pan before slicing.

Servings and timing

This recipe yields about 24 bars.
Preparation time: 15 minutes
Baking time: 25–30 minutes
Cooling time: 1 hour
Total time: 1 hour 45 minutes

Variations

Add chocolate chips for a Reese’s-inspired twist.
Use crunchy peanut butter for added texture.
Top with a drizzle of melted chocolate or peanut butter glaze.
Make a s’mores version by adding crushed graham crackers and mini chocolate chips.

storage/reheating

Store Fluffernutter Bars in an airtight container at room temperature for up to 5 days.
Refrigerate for longer freshness, up to 10 days.
Freeze for up to 2 months—wrap tightly in plastic and store in a freezer-safe container.
Let come to room temperature or microwave briefly to enjoy warm.

FAQs

Can I use natural peanut butter?
Yes, but the texture may be slightly oilier or denser. Stir well before using.

Is there a substitute for marshmallow fluff?
You can use mini marshmallows, though they may melt unevenly.

Can I make these gluten-free?
Yes, by substituting a 1:1 gluten-free flour blend.

Why is my marshmallow fluff hard to spread?
Try slightly warming it or using a damp spatula to ease spreading.

Can I halve this recipe?
Yes, use an 8×8-inch pan and adjust baking time slightly.

Do they need to be refrigerated?
Not required, but refrigeration can extend freshness.

Can I use almond or cashew butter?
Yes, for a different flavor twist.

How do I prevent overbaking?
Remove when the top is golden and a toothpick comes out with moist crumbs, not wet batter.

Can kids help with this recipe?
Absolutely! Kids can spread the fluff and spoon the dough.

Can I use marshmallows instead of fluff?
Mini marshmallows can work, but the texture will differ slightly.

Conclusion

Fluffernutter Bars are a fun, easy-to-make dessert that delivers the nostalgic flavors of childhood in a rich, chewy bite. Whether you’re indulging in a treat for yourself or sharing with friends and family, these bars are sure to satisfy every sweet tooth with their perfect balance of peanut butter and marshmallow goodness.

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