Fluffernutter Bars

If you love that classic peanut butter and marshmallow combination, these Fluffernutter Bars are about to become your new favorite treat. They’re soft, rich, and filled with that sweet, gooey layer that makes every bite feel a little extra special.

Perfect for sharing, baking for gatherings, or simply enjoying with a cup of coffee, these bars are easy to make and incredibly satisfying. They have just the right balance of sweetness, texture, and nostalgic flavor.

Flavor & Texture Highlights

These bars are wonderfully soft with a tender peanut butter base and a gooey marshmallow center. The top bakes up lightly golden with a slight crisp edge, while the inside stays rich and chewy. If you add chocolate chips, you’ll get little pockets of melty sweetness throughout.

Why You’ll Love This Recipe

Soft, gooey, and full of flavor
Easy to make with simple ingredients
Perfect for parties or sweet cravings
That classic peanut butter and marshmallow combo
Optional chocolate adds an extra indulgent touch

What You’ll Need to Make This Recipe

Peanut butter gives these bars their rich, nutty base and signature flavor that pairs beautifully with the sweetness of the marshmallow layer.

Butter and sugars create a soft, tender texture while adding depth and warmth to the overall taste.

Marshmallow fluff is the star of the center, creating that irresistible gooey layer that makes these bars so special.

A handful of mini chocolate chips is optional, but highly recommended if you love a little extra sweetness and texture.

Exact measurements are listed in the recipe card below.

How to Make Fluffernutter Bars Step by Step

Step 1: Prepare the Pan

Preheat your oven to 350°F (175°C). Grease and line an 8x8-inch baking pan with parchment paper for easy removal.

Step 2: Cream the Butter and Sugars

In a mixing bowl, cream together the softened butter, peanut butter, granulated sugar, and brown sugar until light and fluffy.

Step 3: Add Egg and Vanilla

Mix in the egg and vanilla extract until the mixture is smooth and well combined.

Step 4: Combine Dry Ingredients

In a separate bowl, whisk together the flour, baking powder, and salt. Gradually add this to the wet mixture, mixing until a soft dough forms.

Step 5: Layer the Dough

Spread half of the dough evenly into the prepared pan, pressing it gently into the corners.

Step 6: Add the Marshmallow Layer

Drop spoonfuls of marshmallow fluff over the dough and gently spread it out. Sprinkle chocolate chips over the top if using.

Step 7: Add the Top Layer

Crumble the remaining dough over the marshmallow layer, lightly pressing it down to cover most of the surface.

Step 8: Bake

Bake for 25–30 minutes, until the top is golden brown. Let the bars cool completely before slicing to keep the layers intact.

Expert Tips

Use room temperature butter for easier mixing.
Don’t overbake—this keeps the center soft and gooey.
Let the bars cool fully before cutting for clean slices.
Lightly grease your spoon when spreading marshmallow fluff to prevent sticking.

How to Store and Reheat It

Store the bars in an airtight container at room temperature for up to 3 days.

If you prefer them warm, microwave a slice for a few seconds to bring back that gooey texture.

What to Serve With

These bars are perfect on their own, but they pair beautifully with a glass of milk, coffee, or even a scoop of vanilla ice cream for an extra indulgent dessert.

Frequently Asked Questions

Can I use crunchy peanut butter?
Yes, it will add a bit of texture to the bars.

Can I skip the chocolate chips?
Absolutely, the bars are still delicious without them.

Why did my marshmallow layer disappear?
It melts into the bars as they bake, creating that soft, gooey center.

Can I double the recipe?
Yes, simply use a 9x13-inch pan and adjust the baking time slightly.