Quick Benefits
Fluffernutter bars are a delicious combination of creamy peanut butter and marshmallow fluff, creating a dessert that’s both indulgent and easy to make. Perfect for parties, potlucks, or a sweet snack, these bars are a guaranteed crowd-pleaser. Plus, they only require a few simple ingredients and minimal preparation time, making them ideal for any busy baker.
Essential Ingredients
Base:
- 3/4 cup unsalted butter, melted
- 1 cup brown sugar
- 1/2 cup granulated sugar
- 2 eggs
- 2 teaspoons vanilla extract
- 3/4 cup creamy peanut butter
- 1/2 teaspoon salt
- 1 1/2 cups all-purpose flour
Frosting:
- 1/2 cup unsalted butter, softened
- 1 7-ounce container marshmallow fluff
- 2 cups powdered sugar
- 1/2 cup chopped peanuts
Preparation Steps
- Preheat the oven to 175°C (350°F). Grease a 9×13-inch pan with nonstick cooking spray and set aside.
- In a large bowl, mix the melted butter, brown sugar, and granulated sugar using a hand mixer until blended. Add eggs and vanilla extract and mix until fully incorporated. Then mix in the peanut butter until smooth.
- In a separate bowl, whisk together the salt and flour. Slowly add the dry mixture to the wet mixture and mix until just combined.
- Spread the batter evenly into the prepared pan. Bake for 25–30 minutes, or until golden and a toothpick inserted in the center comes out clean. Let the bars cool completely after removing them from the oven.
- In a large bowl, beat the softened butter and marshmallow fluff together. Gradually add powdered sugar, one cup at a time, until blended and smooth.
- Spread the frosting evenly over the cooled bars and sprinkle chopped peanuts on top. Cut into portions and serve.

Health Benefits
While Fluffernutter bars are undeniably a treat, they do offer some nutritional perks. Peanut butter is a great source of protein and healthy fats, while marshmallow fluff provides a touch of sweetness without overwhelming calories. Opting for unsalted butter and minimizing added sugars can also make these bars slightly more balanced.
Serving Suggestions
Serve these fluffernutter bars with a cold glass of milk or a hot cup of coffee. For an extra twist, drizzle some melted chocolate on top or pair them with a scoop of vanilla ice cream for a decadent dessert.
Creative Variations
- Chocolate Chip Fluffernutter Bars: Add a cup of chocolate chips to the batter for a gooey, chocolatey version.
- Crunchy Twist: Swap creamy peanut butter for crunchy to add texture.
- Gluten-Free Option: Substitute all-purpose flour with a gluten-free blend.
Storage Tips
Store the bars in an airtight container at room temperature for up to three days or in the refrigerator for up to a week. For longer storage, freeze individual portions wrapped in plastic wrap and store in a freezer-safe bag.
Pro Tips
- Always use room-temperature ingredients for a smoother batter and frosting.
- Line your baking pan with parchment paper for easy removal.
- Allow the bars to cool completely before frosting to avoid melting the buttercream.
Frequently Asked Questions
Q: Can I use crunchy peanut butter instead of creamy? A: Absolutely! Crunchy peanut butter adds a delightful texture.
Q: How do I know when the bars are done baking? A: Insert a toothpick into the center; if it comes out clean, they’re ready.
Q: Can I double the recipe for a larger batch? A: Yes, just use a larger pan and adjust the baking time accordingly.
Enjoy these easy, delicious fluffernutter bars for any occasion!
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Easy Fluffernutter Bars: A Sweet and Savory Treat
Easy Fluffernutter Bars are a decadent combination of creamy peanut butter and marshmallow fluff, layered with a soft, chewy base and topped with fluffy frosting. These bars are perfect for peanut butter lovers and make a great dessert for parties, potlucks, or simple family treats. Quick to prepare and absolutely delicious!
- Total Time: 45 minutes
Ingredients
Base:
- 3/4 cup unsalted butter, melted
- 1 cup brown sugar
- 1/2 cup granulated sugar
- 2 eggs
- 2 teaspoons vanilla extract
- 3/4 cup creamy peanut butter
- 1/2 teaspoon salt
- 1 1/2 cups all-purpose flour
Frosting:
- 1/2 cup unsalted butter, softened
- 1 7-ounce container marshmallow fluff
- 2 cups powdered sugar
- 1/2 cup chopped peanuts
Instructions
- Preheat the oven to 175°C (350°F). Grease a 9×13-inch pan with nonstick cooking spray and set aside.
- In a large bowl, mix the melted butter, brown sugar, and granulated sugar using a hand mixer until blended. Add eggs and vanilla extract and mix until fully incorporated. Then mix in the peanut butter until smooth.
- In a separate bowl, whisk together the salt and flour. Slowly add the dry mixture to the wet mixture and mix until just combined.
- Spread the batter evenly into the prepared pan. Bake for 25–30 minutes, or until golden and a toothpick inserted in the center comes out clean. Let the bars cool completely after removing them from the oven.
- In a large bowl, beat the softened butter and marshmallow fluff together. Gradually add powdered sugar, one cup at a time, until blended and smooth.
- Spread the frosting evenly over the cooled bars and sprinkle chopped peanuts on top. Cut into portions and serve.
- Prep Time: 15 minutes
- Cook Time: 30 minutes
- Category: Dessert
- Cuisine: American
Nutrition
- Serving Size: 12
- Calories: 320 per serving