Fluffernutter marshmallow Cookies

If you love the classic combination of peanut butter and marshmallow, these Fluffernutter Cookies are about to become your new favorite treat! Made with soft, chewy peanut butter cookies and a fluffy marshmallow buttercream filling, these irresistible sandwich cookies deliver the perfect balance of sweet, salty, rich, and creamy flavors.

Inspired by the nostalgic fluffernutter sandwich, this dessert transforms two simple favorites into a bakery-style cookie that’s perfect for sharing. Each cookie has a tender peanut butter center, lightly crisp edges, and a generous layer of sweet marshmallow frosting tucked between two cookies.

These homemade Fluffernutter Sandwich Cookies are ideal for birthday parties, holiday cookie trays, bake sales, afternoon snacks, or whenever you’re craving something a little different. Although they look impressive, the recipe uses familiar baking ingredients and straightforward steps to create a delicious dessert everyone will want to try.

Why You’ll Love These Fluffernutter Cookies

• The perfect sweet-and-salty combination: Rich peanut butter cookies pair beautifully with sweet, fluffy marshmallow frosting.
• Soft and chewy texture: Brown sugar, butter, and peanut butter create tender cookies with deliciously chewy centers.
• A fun sandwich-cookie twist: Two peanut butter cookies and a creamy filling make every bite extra satisfying.
• Nostalgic flavor: Inspired by the classic peanut butter and marshmallow fluff combination, these cookies bring a little childhood magic to dessert time.
• Great for sharing: This recipe makes approximately 24 sandwich cookies, depending on the size of your cookies and how you assemble them.
• Perfect for special occasions: Their creamy filling and homemade appearance make them a standout addition to cookie platters, parties, and holiday celebrations.
• Easy to customize: Add chopped peanuts, adjust the frosting consistency, or experiment with different decorations for your own delicious variation.

Ingredients You’ll Need

For the Peanut Butter Cookies

• 2¾ cups all-purpose flour: Provides the structure needed for soft cookies that hold their shape when sandwiched together. Spoon the flour into your measuring cup and level it off for accuracy.
• 1 tablespoon cornstarch: Helps create a tender, soft texture.
• 1 teaspoon baking soda: Gives the cookies a little lift and helps them bake evenly.
• ½ teaspoon salt: Balances the sweetness and enhances the peanut butter flavor.
• 1 cup unsalted butter, softened: Adds richness and helps create a smooth cookie dough.
• 1 cup granulated sugar: Contributes sweetness and helps the cookies develop lightly crisp edges.
• 1 cup lightly packed brown sugar: Adds moisture, a subtle caramel flavor, and a chewy texture.
• 1 cup regular creamy peanut butter: Creates the signature peanut butter flavor. Use conventional, well-stirred but non-natural peanut butter rather than natural or whipped varieties for more consistent results.
• 2 large eggs: Bind the ingredients together and contribute to the cookies’ soft texture.
• 2 teaspoons vanilla extract: Adds warmth and rounds out the peanut butter flavor.
• ¼ cup chopped peanuts, optional: Provides a little crunch and makes a delicious topping for the cookies.

For the Marshmallow Frosting

• 1 cup unsalted butter, softened: Forms the rich, creamy base of the frosting.
• 2 cups powdered sugar, sifted: Sweetens the filling and helps it develop a smooth consistency.
• 1 jar (7 ounces) marshmallow creme: Gives the frosting its fluffy texture and classic marshmallow flavor.
• 1 tablespoon milk or cream, if needed: Helps loosen the frosting if it becomes too thick to spread easily.

How to Make Fluffernutter Cookies

Step 1: Prepare the Oven and Baking Sheets

Preheat your oven to 350°F (175°C). Line your baking sheets with parchment paper or silicone baking mats to prevent sticking and encourage even baking.

Gather your ingredients before starting, and make sure the butter is softened to room temperature. This helps the butter and sugars cream together smoothly.

Step 2: Combine the Dry Ingredients

In a large bowl, whisk together the all-purpose flour, cornstarch, baking soda, and salt until evenly combined.

Set the bowl aside while you prepare the wet ingredients. Mixing the dry ingredients separately helps distribute the baking soda and salt throughout the flour, resulting in more consistent cookies.

Step 3: Cream the Butter and Sugars

In a separate large mixing bowl, beat the softened butter, granulated sugar, and brown sugar with an electric mixer until the mixture becomes light and fluffy.

This usually takes a few minutes, depending on your mixer. Scrape down the sides of the bowl as needed so everything is incorporated evenly.

Properly creamed butter and sugar help create a tender cookie texture and a well-balanced crumb.

Step 4: Add the Peanut Butter, Eggs, and Vanilla

Beat the peanut butter into the butter-and-sugar mixture until smooth.

Add the eggs and vanilla extract, mixing until the ingredients are fully incorporated. Scrape the bowl once more to ensure there are no pockets of unmixed butter or peanut butter.

The mixture should look creamy and smell wonderfully rich and nutty.

Step 5: Mix in the Dry Ingredients

Reduce the mixer to low speed and gradually add the flour mixture.

Mix just until the dry ingredients disappear and a soft cookie dough forms. Avoid overmixing, as too much mixing can develop the gluten in the flour and make the cookies less tender.

If desired, reserve the chopped peanuts for decorating the tops of the cookies rather than mixing them into the dough.

Step 6: Shape the Cookies

Scoop the dough into portions of approximately one tablespoon each and roll them gently into balls.

Arrange the dough balls on the prepared baking sheets, leaving at least two inches between them to allow room for spreading.

If you’re using chopped peanuts, gently press a few pieces onto the top of each dough ball.

For the neatest sandwich cookies, try to keep the portions as uniform as possible so the baked cookies are similar in size.

Step 7: Bake Until Just Set

Bake the cookies for approximately 8–10 minutes, or until the tops look just set.

The cookies may still appear slightly soft in the center when they come out of the oven. That’s normal and helps them retain a chewy texture as they cool.

Allow the cookies to rest on the baking sheet for a few minutes before transferring them to a wire rack. Let them cool completely before adding the marshmallow frosting.

Important: Don’t frost warm cookies. The heat can melt the butter in the filling, causing the frosting to slide out when you assemble the sandwiches.

Step 8: Beat the Butter for the Frosting

Place the softened butter in a large mixing bowl. Beat with an electric mixer until smooth and creamy.

Gradually add the sifted powdered sugar on low speed, mixing carefully to avoid a cloud of sugar. Once incorporated, continue beating until the frosting base is smooth.

Scrape down the sides of the bowl as needed to keep the mixture even.

Step 9: Add the Marshmallow Creme

Add the marshmallow creme to the butter and powdered sugar mixture.

Beat on medium speed until the frosting is light, fluffy, and evenly combined. If it seems too thick to spread, add the milk or cream a little at a time, using up to one tablespoon as needed.

The finished marshmallow frosting should be creamy enough to spread but firm enough to stay between the cookies.

Step 10: Assemble the Fluffernutter Sandwich Cookies

Choose two cookies of similar size for each sandwich.

Spread or pipe a generous layer of marshmallow frosting onto the flat underside of one cookie. Place a second cookie on top, flat side facing the filling, and press gently until the frosting reaches close to the edges.

Repeat with the remaining cookies and frosting.

For the best texture, allow the assembled cookies to rest briefly before serving so the filling settles into place. Enjoy them at room temperature or store them appropriately until you’re ready to share.

Tips for the Best Fluffernutter Cookies

• Measure the flour correctly: Too much flour can make the cookies dry or crumbly. Spoon it into your measuring cup and level the top rather than scooping directly from the bag.
• Use softened, not melted, butter: Soft butter creams properly with sugar and helps create the right cookie texture.
• Choose the right peanut butter: Conventional creamy peanut butter provides a more predictable dough consistency than natural peanut butter, which can separate.
• Avoid overmixing the dough: Once the flour is incorporated, stop mixing to keep the cookies tender.
• Keep the cookies similar in size: Evenly sized cookies are easier to pair into neat sandwich cookies.
• Don’t overbake: Remove the cookies when the tops look just set. They will continue to firm up as they cool.
• Cool completely before filling: Warm cookies can melt the marshmallow frosting and make assembly messy.
• Adjust the frosting gradually: Add milk or cream sparingly so the filling remains thick enough to hold the sandwich together.
• Use a piping bag for neat edges: Piping the frosting onto the cookies makes it easier to create evenly filled sandwiches.
• Let the filling settle: After assembly, give the cookies a little time to rest before stacking or transporting them.

Equipment Needed

You can make these homemade Fluffernutter Cookies with basic baking equipment.

• Electric hand mixer or stand mixer: Creams the butter and sugars and makes the marshmallow frosting smooth.
• Large mixing bowls: Keep the dry ingredients, cookie dough, and frosting organized.
• Measuring cups and spoons: Help ensure accurate ingredient proportions.
• Whisk: Combines the flour, cornstarch, baking soda, and salt.
• Rubber spatula: Scrapes down the bowl and helps incorporate ingredients evenly.
• Cookie scoop or tablespoon: Portions the dough into similarly sized cookies.
• Baking sheets: Provide a flat surface for baking the cookies.
• Parchment paper or silicone baking mats: Prevent sticking and make cleanup easier.
• Wire cooling rack: Allows the cookies to cool completely before filling.
• Piping bag, optional: Makes filling the sandwich cookies easier and gives them a neat, bakery-style appearance.

Fluffernutter Cookies Variations

1. Chocolate-Dipped Fluffernutter Cookies

For a chocolatey twist, dip half of each assembled sandwich cookie into melted semisweet or dark chocolate. Place the cookies on parchment paper and let the chocolate set before serving.

The slightly bitter chocolate balances the sweet marshmallow filling and rich peanut butter cookies beautifully.

2. Crunchy Peanut Butter Sandwich Cookies

If you enjoy extra texture, use crunchy conventional peanut butter in the cookie dough or sprinkle additional chopped peanuts over the filling before adding the top cookie.

The extra crunch adds contrast to the soft cookie and fluffy frosting.

3. Chocolate Chip Fluffernutter Cookies

Fold a handful of mini chocolate chips into the finished cookie dough before shaping. The chocolate adds little pockets of sweetness that complement the peanut butter and marshmallow combination.

Mini chips work particularly well because they distribute evenly throughout the smaller cookies.

4. Salted Peanut Butter Fluffernutter Cookies

Sprinkle a tiny pinch of flaky sea salt over the frosting just before placing the top cookie on each sandwich.

The salt enhances the peanut butter flavor and balances the sweetness of the marshmallow creme. Use a light hand so the filling doesn’t become too salty.

5. Fluffernutter Cookie Bars

Instead of shaping individual cookies, press the dough into a parchment-lined baking pan and bake until set, adjusting the baking time for the pan size and thickness.

Once completely cooled, spread the marshmallow frosting over the cookie base and cut it into squares. This version is convenient for parties and bake sales because it requires less individual assembly.

6. Holiday Fluffernutter Sandwich Cookies

Decorate the finished cookies with melted chocolate, colorful sprinkles, or a light dusting of powdered sugar. You can also pipe the marshmallow filling with a decorative tip for a more festive presentation.

These cookies make a fun addition to holiday cookie exchanges, birthday dessert tables, and homemade gift boxes.

What to Serve with Fluffernutter Cookies

These rich peanut butter and marshmallow cookies pair well with simple drinks and desserts that complement their sweet-and-salty flavor.

• Cold milk: A classic pairing that balances the richness of peanut butter and the sweetness of the filling.
• Hot coffee: Its slightly bitter flavor provides a pleasant contrast to the sweet marshmallow frosting.
• Hot chocolate: Creates an indulgent treat for cold afternoons and cozy evenings.
• Vanilla ice cream: Makes a decadent dessert when served alongside a cookie sandwich.
• Fresh strawberries or apple slices: Add a refreshing fruity contrast to the rich cookies.
• Chocolate brownies: Pair beautifully with peanut butter cookies on a dessert platter.
• A dessert board: Arrange the cookies with pretzels, chocolate pieces, and fresh fruit for a mix of sweet and salty flavors.

For an afternoon snack, serve one Fluffernutter Cookie with a glass of cold milk. For parties, arrange several on a platter alongside other homemade cookies and bite-sized desserts.

Frequently Asked Questions

What are Fluffernutter Cookies?

Fluffernutter Cookies are sandwich cookies inspired by the classic combination of peanut butter and marshmallow creme. They feature two soft peanut butter cookies filled with a fluffy marshmallow frosting, creating a sweet, salty, creamy dessert.

Why are my peanut butter cookies dry or crumbly?

Dry cookies can result from using too much flour, overmixing the dough, or baking the cookies for too long. Measure the flour carefully, mix only until the ingredients are combined, and remove the cookies when the tops look just set.

Allow them to cool on the baking sheet for a few minutes before transferring them to a wire rack.

Can I make the marshmallow frosting ahead of time?

Yes. You can prepare the frosting ahead of time and refrigerate it in an airtight container. Before using it, allow it to soften slightly at room temperature and beat it briefly until smooth and spreadable.

If it feels too firm, let it sit a little longer before adjusting the consistency.

Can I use natural peanut butter?

Conventional creamy peanut butter is recommended for this recipe because it has a more consistent texture. Natural peanut butter can separate, making the dough oily or changing how the cookies spread.

For the most reliable results, choose regular creamy peanut butter rather than natural or whipped varieties.

How should I store Fluffernutter Cookies?

Because these cookies contain a butter-and-marshmallow filling, store them in an airtight container in the refrigerator if they won’t be eaten within a short period. Place parchment paper between layers to prevent sticking.

For the best texture, allow refrigerated cookies to sit briefly at room temperature before serving. Follow the storage guidance for your marshmallow creme and other ingredients, and don’t leave the assembled cookies out for extended periods in warm conditions.

Can I freeze Fluffernutter Sandwich Cookies?

Yes. Arrange the assembled cookies in a freezer-safe container, separating layers with parchment paper. Freeze until firm and use within about 1–2 months for the best quality.

Thaw them in the refrigerator, then allow them to soften slightly before serving. The filling may have a slightly different texture after freezing, so test one cookie first if you’re preparing them for a special occasion.

Final Thoughts

These Fluffernutter Cookies are a delicious celebration of the classic peanut butter and marshmallow combination. Soft, chewy peanut butter cookies sandwich a sweet, fluffy filling, creating a dessert that’s nostalgic, satisfying, and wonderfully easy to share.

Whether you’re baking for a party, preparing a holiday cookie tray, or simply craving a homemade treat, these sandwich cookies are a fun alternative to traditional peanut butter cookies. Customize them with chocolate, crunchy peanuts, or a sprinkle of sea salt to make them your own.

Give these Fluffernutter Cookies a try! Bake a batch, let the cookies cool completely, fill them with fluffy marshmallow frosting, and enjoy the irresistible combination of sweet, salty, creamy, and chewy in every bite.

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