Soft & Gooey Fluffernutter Cookies

Soft, chewy peanut butter cookies filled with gooey marshmallow fluff—because classic nostalgia deserves bakery-level treatment.

Some cookies are just comfort in a bite.

Such is the case with these delicious fluffernutters. They take the luscious depth of a good peanut butter cookie and merge it with marshmallow fluff for an outcome that's both decadent and dreamy.

It's also unique enough to leave an impression when you take them to that next event. Folks will be talking about them for ages to come.

In my kitchen I've already got room for one more recipe, and this holiday season Fluffernutter's flew to the top of the list.

What is a Fluffernutter?

Simply put, it's a peanut butter cookie with a dollop of marshmallow fluff baked into the center. As it bakes, the fluff "escapes" the cookie's exterior and leaves a splattering of color.

Simply put, it's art in cookie form.

Or would that be cookie in art form?

Regardless, they're lovely to look at and delicious to eat. And I promise, once you try them you'll want to make them again and again.

In fact, I'm so sure of that, that I'm offering you two versions: Traditional and sandwich. Because. . .hey. One can never have too much marshmallow fluff!

So, what's keeping us? Let's bake some cookies!

Fluffernutter Ingredients

You'll find a printable recipe card at the bottom of this post but here's a glance at what you'll need. These are pantry staples you probably have on hand. And if you don't happen to have marshmallow fluff, you can always use mini marshmallows (3-4 per cookie). Here's what you'll need:

• 1 cup butter, softened
• 1 cup creamy peanut butter
• 1 cup granulated sugar
• ¾ cup light brown sugar (added moisture)
• 2 large eggs
• 1 extra egg yolk (chew factor)
• 2 teaspoon vanilla extract
• 2¾ cups all-purpose flour
• 1 teaspoon baking soda
• ½ teaspoon baking powder
• ½ teaspoon salt
• 1 tablespoon milk or cream (soft texture boost)

Filling

• 1½–2 cups marshmallow fluff

How to Make Fluffernutters

These might look (or sound) complicated, but they're not. Once you conquer the art of getting that fluff to stay put in the middle of the dough you'll be in fine shape! Here's how you're going to do it:

Cream butter, peanut butter, and both sugars until light and fluffy.

Beat in eggs, extra yolk, and vanilla.

Mix in milk (or cream).

Whisk flour, baking soda, baking powder, and salt.

Add dry ingredients to wet until just combined.

Chill dough 30–45 minutes (important for stuffing cleanly).

How to Assemble

Scoop 1½ tablespoon chilled dough, flatten slightly.

Add 1 teaspoon marshmallow fluff to center.

Top with another small scoop of dough.

Seal edges completely. Roll gently into a smooth ball.

Chill assembled balls 10 minutes before baking.

Bake

Bake at 350°F for 10–12 minutes. Remove from oven while centers look pale and puffy.

Cool on a wire rack for 10 minutes before serving.

Serve and Enjoy!

(You're going to flip over these soft, luscious cookies!)

Optional Sandwich Cookies:

If you like, you can sandwich two of the cookies together with marshmallow fluff between them.

Pro Baking Tips

• Slight underbaking = marshmallow magic.
• If your fluff seeps, you didn’t seal edges tightly enough.
• For crinkle tops, roll dough balls in sugar before baking (not for stuffed version).

What to Expect from These Cookies

They're rich, they're sticky, they're luscious, they're creamy, they're flaky. . .they're everything. These cookies are a surprise in every bite. And trust me, you'll want to take lots and lots of bites.

That creamy marshmallow, sticky and sweet. . .that creamy peanut butter, smooth and delicious. . .it all comes together in a memorable cookie that's perfect for your family, your friends, a party, or even a simple afternoon snack.

Other Peanut Butter Favorites from Out of the Box

If you love peanut butter you're bound to enjoy these other sweet treats:

• Easy Peanut Butter Snowballs: A simple and delicious candy, reminiscent of Reese's Peanut Butter Cups
• Classic Peanut Butter Blossoms: If you love the mergence of chocolate and peanut butter, these will make your day!
• Peanut Butter Ranger Cookies: I call these my "Everything but the Kitchen Sink" cookies. They're loaded with flavor and texture!

That's it for this post, friends!

If you like this recipe, please leave a comment or review. And before you rush off, why not pin some photos to your Pinterest boards?

Janice Thompson is a professional baker, cake designer, and author with over 20 years of experience creating unique cakes and desserts. She’s the creator of Out of the Box Baking, where she shares her favorite doctored cake mix recipes, tutorials, and baking tips. Learn more →