Irresistible Fluffernutter Bars

If you’re a fan of the classic peanut butter and marshmallow fluff sandwich, these Fluffernutter Bars are about to become your new favorite dessert. With a soft, chewy peanut butter cookie base, a creamy marshmallow layer, and a rich peanut butter topping, every bite is packed with nostalgic flavor.

Perfect for bake sales, family gatherings, lunchbox treats, or holiday dessert tables, these easy dessert bars are simple to make and guaranteed to disappear fast.

Why You’ll Love These Fluffernutter Bars

These dessert bars deliver the perfect balance of sweet, salty, chewy, and creamy textures.

Here’s why they’re always a hit:

• Soft and chewy texture
• Rich peanut butter flavor
• Gooey marshmallow filling
• Easy pantry ingredients
• Great for parties and potlucks
• Kid-approved dessert
• Perfect for making ahead

“These bars taste just like a classic fluffernutter sandwich in dessert form. They’re rich, chewy, and impossible to eat just one!”

How to Make Fluffernutter Bars

These layered bars are surprisingly easy to prepare. You’ll bake a soft peanut butter cookie base, spread on fluffy marshmallow crème, then finish with a smooth peanut butter topping before slicing into irresistible squares.

The result is a bakery-style dessert that’s both nostalgic and incredibly satisfying.

Ingredients

For the Cookie Base

• 1 cup unsalted butter, softened
• 1 cup creamy peanut butter
• 1 cup brown sugar
• ½ cup granulated sugar
• 2 large eggs
• 2 teaspoons vanilla extract
• 2½ cups all-purpose flour
• 1 teaspoon baking powder
• ½ teaspoon salt

For the Filling

• 1 jar (7 ounces) marshmallow crème

Optional Peanut Butter Topping

• ½ cup creamy peanut butter
• 1 cup powdered sugar
• 2 tablespoons milk
• 1 teaspoon vanilla extract

Optional Garnishes

• Mini marshmallows
• Chopped roasted peanuts
• Chocolate drizzle
• Peanut butter chips

Ingredient Substitutions

• Crunchy peanut butter adds extra texture.
• Almond butter works as an alternative.
• Gluten-free flour blend can replace all-purpose flour.
• Homemade marshmallow fluff may be used if preferred.

Directions

1. Preheat your oven to 350°F (175°C).
2. Grease or line a 9×13-inch baking pan with parchment paper.
3. Beat together the butter, peanut butter, brown sugar, and granulated sugar until light and fluffy.
4. Add the eggs one at a time.
5. Mix in the vanilla extract.
6. In another bowl, whisk together the flour, baking powder, and salt.
7. Gradually combine the dry ingredients with the wet ingredients.
8. Spread the dough evenly into the prepared baking pan.
9. Bake for 20–25 minutes, or until lightly golden.
10. Allow the cookie base to cool completely.
11. Spread the marshmallow crème evenly over the cooled base.
12. If making the topping, whisk together the peanut butter, powdered sugar, milk, and vanilla until smooth.
13. Spread the peanut butter topping over the marshmallow layer.
14. Refrigerate for about 30 minutes before slicing into bars.

How to Serve Fluffernutter Bars

These dessert bars are delicious served chilled or at room temperature.

Serve them with:

• Cold milk
• Hot coffee
• Hot chocolate
• Vanilla ice cream
• Chocolate ice cream
• Fresh strawberries
• Banana slices

For parties, cut them into smaller squares for easy grab-and-go treats.

How to Store Fluffernutter Bars

These bars stay wonderfully soft for several days when stored correctly.

Room Temperature

Store in an airtight container for up to 3 days.

Refrigerator

For longer freshness, refrigerate for up to 1 week.

Freezer

Freeze individually wrapped bars for up to 2 months.

Allow them to thaw at room temperature before serving.

Make-Ahead Tip

These bars are an excellent make-ahead dessert because the layers become even easier to slice after chilling.

Tips for the Best Fluffernutter Bars

Don’t Overbake

The cookie base should remain soft and chewy.

Cool Completely

Allow the base to cool before adding the marshmallow layer to prevent melting.

Use Creamy Peanut Butter

Smooth peanut butter creates the best texture for both the cookie and topping.

Chill Before Slicing

Refrigerating the bars helps create neat, clean squares.

Use a Sharp Knife

Wipe the knife between cuts for bakery-style presentation.

Delicious Variations

Chocolate Fluffernutter Bars

Add chocolate chips to the cookie dough or drizzle melted chocolate over the top.

Peanut Butter Cup Bars

Fold chopped peanut butter cups into the dough before baking.

Crunchy Peanut Bars

Mix chopped roasted peanuts into the topping.

Salted Caramel Fluffernutter Bars

Drizzle caramel sauce over the finished bars and sprinkle with flaky sea salt.

Mini Marshmallow Version

Scatter mini marshmallows over the marshmallow crème for extra texture.

Frequently Asked Questions

What is a fluffernutter?

A fluffernutter is a classic sandwich made with peanut butter and marshmallow crème, traditionally served on soft white bread.

Can I make Fluffernutter Bars ahead of time?

Yes. They’re actually easier to slice after chilling for several hours or overnight.

Do these bars need refrigeration?

They can be stored at room temperature for a few days, but refrigeration helps them stay fresh longer and keeps the layers firm.

Can I freeze Fluffernutter Bars?

Absolutely. Wrap each bar individually and freeze for up to two months.

Can I use crunchy peanut butter?

Yes. Crunchy peanut butter adds extra texture while still providing the classic peanut butter flavor.

Conclusion

These Fluffernutter Bars are the perfect combination of soft peanut butter cookie, fluffy marshmallow crème, and creamy peanut butter topping. Every bite is rich, chewy, and filled with nostalgic flavor that’s sure to please both kids and adults alike.

Whether you’re baking for holidays, potlucks, family movie nights, or simply satisfying a sweet craving, this easy dessert recipe is guaranteed to become a favorite you’ll make again and again.

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For more incredible recipes, cooking inspiration, and easy meal ideas, visit our blog Bellie’s Kitchen and explore our growing collection of delicious homemade recipes!

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