Fluffernutter Cookies are the nostalgic, elevated treat your kitchen has been missing. If you grew up loving the classic combination of creamy peanut butter and sweet marshmallow fluff, these cookies take that iconic duo to a professional bakery level. This recipe features a thick, golden-brown peanut butter base that shatters slightly at the edges, revealing a dramatic, ultra-stretchy white gooey marshmallow center that stays soft even after cooling. We have perfected the balance of sweet and salty by embedding melted dark chocolate chips and a generous sprinkle of flaky sea salt on top, making these the most requested cookies in my collection.
Why You Will Obsess Over These Stuffed Fluffernutter Cookies
These aren’t your average peanut butter cookies. We have engineered this recipe to maximize vertical height and texture, ensuring every bite is a multi-sensory experience. Here is what makes this version stand out:
- The Dramatic Pull: Thanks to a specific chilling technique, the marshmallow core remains distinct and stretchy rather than dissolving into the dough.
- Bakery-Style Texture: The edges are crisp and golden-brown, while the centers remain soft, chewy, and slightly underbaked for that “melt-in-your-mouth” feel.
- Balanced Flavor Profile: The bitterness of the dark chocolate chips and the crunch of coarse flaky sea salt cut through the richness of the peanut butter and marshmallow.
- Visual Appeal: Served on wrinkled white parchment paper, these cookies look just as good as they taste, making them perfect for your next viral Pinterest post.
If you love the combination of salty peanut butter and sweet treats, you should also try my fluffernutter bars or these decadent peanut butter chocolate chip cookies for your next baking session.
The Science of the Perfect Fluffernutter Cookie Ingredients
To achieve that specific “smartphone-photo” look of a thick, golden cookie, we need the right structural foundations. Here is what you will need for these Fluffernutter Cookies:
- 1 cup (225g) Unsalted Butter, Softened: Provides the fat necessary for a tender crumb. Ensure it is cool to the touch but pliable.
- 1 cup (250g) Creamy Peanut Butter: Use a standard commercial brand (like Jif or Skippy) rather than natural oil-separating butter for better structural stability.
- 1 cup (200g) Packed Light Brown Sugar: The molasses content ensures a chewy, golden-brown finish.
- 1/2 cup (100g) Granulated White Sugar: This aids in creating those slightly crisp, cracked edges.
- 1 Large Egg + 1 Egg Yolk: The extra yolk adds richness and prevents the cookie from becoming cakey.
- 1 tsp (5ml) Vanilla Extract: Enhances the aromatic profile of the peanut butter.
- 2 & 1/2 cups (312g) All-Purpose Flour: The backbone of the cookie; measured precisely to prevent a dry dough.
- 1 tsp (5g) Baking Soda: Provides the necessary lift and aids in browning.
- 1/2 tsp (3g) Kosher Salt: To balance the internal sugars.
- 12-15 Large Marshmallows: These will be frozen briefly to ensure they create that dramatic gooey center.
- 1/2 cup (90g) Dark Chocolate Chips: High-quality 60% cacao chips melt beautifully against the warm cookie.
- Flaky Sea Salt: For the final, professional finish.
If you are a fan of stuffed treats, you won’t want to miss my banana pudding cookies which also feature a hidden surprise inside!
Step-by-Step Instructions for the Perfect Cookie Pull
1. Prepare the Marshmallow Core
Place your large marshmallows on a small tray and pop them into the freezer for at least 20 minutes. Cold marshmallows are the secret to preventing the center from completely evaporating into the dough during the high-heat bake, ensuring that thick white gooey marshmallow look.
2. Cream the Peanut Butter and Fats
In a large bowl or stand mixer, beat the softened butter, creamy peanut butter, brown sugar, and white sugar. Cream them on medium-high for about 3 minutes until the mixture looks pale and fluffy. This aeration is key to the cracked texture we want later.
3. Incorporate Dry Ingredients
Slowly add the egg, egg yolk, and vanilla, mixing until just combined. In a separate bowl, whisk the flour, baking soda, and kosher salt. Gradually add the dry ingredients to the wet, mixing on low speed until no flour streaks remain. Do not overmix, or the Fluffernutter Cookies will become tough.
4. Stuffing and Shaping
Scoop about 2 tablespoons (approx. 50g) of dough and flatten it into a disc in your palm. Place one chilled marshmallow in the center. Wrap the dough around the marshmallow, ensuring it is completely sealed with no white showing. If the marshmallow is exposed, it will leak out and caramelize on the pan rather than staying gooey inside.
5. The Signature Topping
Place the dough balls onto a baking sheet lined with wrinkled white parchment paper. Gently press 3-4 dark chocolate chips into the top of each dough ball. This ensures the chocolate is visible and “embedded” just like in the professional photos.
6. Baking for Texture
Bake at 350°F (175°C) for 10-12 minutes. The cookies are done when the edges are golden-brown and the tops have developed beautiful cracks, but the center still looks slightly soft. Immediately upon removing from the oven, sprinkle with a pinch of flaky sea salt. Let them rest on the pan for 5 minutes to set.
Expert Tips for Success
- Freeze the Marshmallows: I cannot stress this enough! It delays the melting point so you get a “pull” rather than a hollow cavity.
- The “Soothe” Technique: If your cookies come out slightly irregular, use a large circular cookie cutter to “scoot” the warm cookies into perfect circles immediately after baking.
- Use Dark Chocolate: Semi-sweet or milk chocolate can make these overly sweet. Dark chocolate chips provide the necessary contrast.
- Avoid Natural Peanut Butter: The oil separation in natural peanut butter will cause these cookies to spread too thin, losing the thick, handheld quality.
For more indulgent textures, check out my recipe for gooey chocolate chip cookies.
Storage, Reheating, and Freezing
Storage: Keep these Fluffernutter Cookies in an airtight container at room temperature for up to 3 days. To maintain the marshmallow stretch, I recommend eating them within 24 hours.
Reheating: To get that dramatic gooey center back after the cookies have cooled, microwave a single cookie for 8-10 seconds. The marshmallow will soften instantly!
Freezing: You can freeze the unbaked stuffed dough balls for up to 3 months. Bake directly from frozen, adding 2-3 minutes to the total bake time.
What to Serve With Fluffernutter Cookies
These cookies are incredibly rich, so they pair best with beverages that offer a bit of bitterness or neutral creaminess. A cold glass of whole milk is the classic choice, but a hot oat milk latte or a dark roast coffee perfectly complements the dark chocolate chips and flaky sea salt. If you’re hosting a dessert party, serve these alongside my banana bread cookies for a full “bakery-style” spread.
Frequently Asked Questions
Yes, you can substitute the all-purpose flour for a high-quality 1:1 gluten-free baking flour blend. Peanut butter and marshmallows are naturally gluten-free, but always check your labels.
You can, but it is much messier! If using fluff, freeze small dollops on parchment paper until solid before stuffing them into the dough balls.
The cracked texture comes from the balance of white and brown sugar and not overmixing the dough. The high heat of the oven causes the surface to set and crack as the marshmallow expands.
For this specific recipe, processed creamy peanut butter (like Jif) is best. Natural peanut butters contain too much oil and can cause the cookies to spread too thin.
If the marshmallow melts completely into the dough, it’s usually because it wasn’t cold enough or the dough wasn’t sealed tightly. Freezing the marshmallows for 20 minutes before stuffing helps them retain their shape and ‘pull’.
The Ultimate Fluffernutter Cookies Recipe
Fluffernutter Cookies: The Ultimate Gooey Marshmallow Stuffed Recipe
Ingredients
Equipment
Method
- Place marshmallows in the freezer for 20 minutes to ensure they stay gooey during baking.
- Cream the butter, peanut butter, and both sugars for 3 minutes until light and fluffy.
- Beat in the egg, yolk, and vanilla. Gradually fold in the flour, baking soda, and salt until just combined.
- Flatten 2 tbsp of dough, place a frozen marshmallow in the center, and seal completely.
- Top with dark chocolate chips. Bake at 350°F (175°C) for 10-12 minutes. Sprinkle with flaky sea salt immediately.
Notes
Do not overbake; the center should look soft when removed from the oven.
Join the Community!
Did you get that perfect, ultra-stretchy marshmallow pull? I want to see! Please save this recipe to your Pinterest “Baking” board so you never lose it. If you make these Fluffernutter Cookies, leave a comment below with a photo of your creation and don’t forget to give this recipe a 5-star rating. Follow @KellyTaste for more gooey, bakery-style treats!
