Name: Fluffernutter Cookies
Prep time: 15 min
Cook time: 12 min
Total time: 27 min
Cuisine: American
Ingredients: ½ cup creamy peanut butter; ½ cup unsalted butter; 1 cup brown sugar; 1 large egg; 1 teaspoon vanilla extract; 1½ cups all-purpose flour; 1 teaspoon cornstarch; ½ teaspoon salt; 1 cup marshmallow fluff

Jump to Recipe

Fluffernutter Cookies bring together rich peanut butter and sweet marshmallow fluff in one irresistible dessert. These cookies deliver a soft, chewy texture with a gooey center that melts in every bite. If you love peanut butter cookies and crave a nostalgic twist, this recipe offers a simple yet delicious way to bake something special at home. With just a few pantry staples, you can create a batch of cookies that feel both comforting and indulgent.

Story

I first made Fluffernutter Cookies on a weekend when I wanted something quick but still memorable. I already loved classic peanut butter desserts, so combining them with marshmallow fluff felt like a natural step. As soon as I baked the first batch of Fluffernutter Cookies, the aroma filled the kitchen and drew everyone in. Since then, Fluffernutter Cookies have become my go-to treat when I want something soft, sweet, and slightly nostalgic. Because they remind me of childhood sandwiches, they always bring a sense of comfort with every bite.

Ingredients

½ cup creamy peanut butter
½ cup unsalted butter, room temperature
1 cup light brown sugar, packed
1 large egg, room temperature
1 teaspoon vanilla extract
1½ cups all-purpose flour
1 teaspoon cornstarch
½ teaspoon kosher salt
1 cup marshmallow fluff

Step-by-Step Instructions

Preparing the Ingredients

Start by preheating your oven to 350°F and lining two baking sheets with parchment paper. In a large mixing bowl, combine peanut butter, butter, and brown sugar, then beat until smooth and creamy. Next, add the egg and vanilla extract, mixing until fully incorporated. In another step, measure out the flour, cornstarch, and salt so everything is ready before combining.

Cooking Instructions

Add the dry ingredients to the wet mixture and mix on low speed until just combined. Then, scoop about two tablespoons of dough and place it on the baking sheet. Flatten each portion into a disk, add a spoonful of marshmallow fluff to the center, and wrap the dough around it to seal. After shaping, bake the cookies for 10–12 minutes until the edges turn golden brown. Let them rest for 10–15 minutes before serving so the centers set properly.

Tips for Perfect Results

Common Mistakes to Avoid

Avoid overmixing the dough because it can make the cookies dense instead of soft. Also, do not overfill with marshmallow fluff since it may leak out during baking. Keep an eye on the cookies in the oven because the marshmallow can brown quickly if left too long.

Pro Tips for Better Flavor

Use room temperature ingredients so the dough mixes smoothly and evenly. For a richer taste, choose a high-quality peanut butter with a balanced flavor. You can also chill the dough briefly if it feels too soft, which helps maintain the cookie shape while baking.

Serving and Storage

How to Serve

Serve Fluffernutter Cookies slightly warm so the centers stay soft and gooey. Pair them with a glass of milk or coffee for a comforting dessert experience. These cookies also work well as a fun treat for gatherings or casual celebrations.

How to Store Leftovers

Store leftover cookies in an airtight container at room temperature for up to three days. If you want to keep them longer, refrigerate them and reheat briefly before serving. You can also freeze the baked cookies and thaw them when ready to enjoy.

Conclusion

Fluffernutter Cookies offer the perfect mix of soft texture and gooey sweetness in every bite. Because they are simple to prepare and always satisfying, they make an excellent addition to your dessert rotation. Try this recipe once, and you will likely find yourself making it again and again.

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Frequently Asked Questions

Can I use crunchy peanut butter instead of creamy?

Yes, you can substitute crunchy peanut butter if you want extra texture. However, the cookies will be slightly less smooth and may have a more crumbly bite.

Why is my marshmallow fluff leaking out?

This usually happens when the dough does not fully seal around the filling. Make sure you completely cover the fluff before baking to prevent leaks.

Can I make the dough ahead of time?

Yes, you can prepare the dough in advance and refrigerate it for up to 24 hours. When ready to bake, let it sit at room temperature for a few minutes before shaping.