Fluffernutter Bars

Super soft peanut butter bar cookies with swirls of marshmallow, these Fluffernutter Bars are a peanut butter lover’s dream. 

Fluffernutter Bars

While I grew up loving peanut butter, my daughter has not. She ate it all the time as a toddler but woke up one day saying she hated it. To this day, several years later, she still insists she hates it… except when it’s paired with chocolate. Not Nutella, because “that’s not chocolate,” but regular chocolate. In candy. Whatever. That girl is crazy.  

I’ve been wanting to remake this recipe for several weeks but our weeknights and weekends have been packed. I’ve been behind at work for the past several weeks, and have been working late and weekends to catch up. The kids resumed some winter activities and chauffeuring takes time. And it’s birthday season – lots of friends and family have birthdays early in the year. 

Fluffernutter Bars

So needless to say, it’s taken me a while to find the time to make these and photograph them. I finally carved out a bit of time last weekend to pop them in the oven, and stole some time while dinner was cooking to photograph them. It was a challenge – it was hard to step away from The Crew (affiliate link) – to get dinner on the able and get these photographs.

Totally unrelated to this post, but if you like card games, this is a fun one to check out. It’s a collaborative trick-taking game that gets harder as the rounds go on. We played all of season 1 and started season 2 with our besties and have even gotten my dad playing. 

Fluffernutter Bars

Recipe Notes For Fluffernutter Bars:

  • I’ve made these bars multiple times and have tweaked the about of marshmallow fluff and peanut butter chips used. A bit of extra marshmallow fluff definitely doesn’t hurt. I actually prefer these without peanut butter chips, but both ways are delicious and disappear quickly! 

Want more peanut butter desserts? These Chocolate Chip Peanut Butter Cookies with Sea Salt are my all time favorite peanut butter cookies. They’re super soft and that sprinkle of sea salt is perfection. Or, try a family favorite and one of my most requested items, my mother-in-law’s Peanut Butter Balls.

Fluffernutter Bars

Fluffernutter Bars

Fluffernutter Bars

Super soft peanut butter bar cookies with swirls of marshmallow, these Fluffernutter Bars are a peanut butter lover's dream. 

Course Dessert
Cuisine American
Prep Time 10 minutes
Cook Time 25 minutes
Total Time 35 minutes
Servings 16
Author Liz


  • cooking spray
  • 6 Tbs. unsalted butter melted cooled
  • 2 large eggs
  • c. creamy peanut butter not natural peanut butter
  • 1 c. firmly packed light sugar
  • ½ c. granulated sugar
  • c. all-purpose flour
  • ½ c. peanut butter chips optional
  • 6 Tbs. marshmallow fluff
  • mini-marshmallows for topping
  • peanut butter chips for topping


  1. Preheat the oven to 350ºF. Line an 8″ x 8″ baking pan with parchment paper. Spray with cooking spray and set aside.

  2. In a medium size bowl, whisk together the cooled butter, eggs, peanut butter, and both sugars until smooth. Switch to a good silicon spatula or sturdy spoon and mix in flour until just combined. Fold in 1/2 c. peanut butter chips, if using.

  3. Spoon in the marshmallow creme and use a spatula or butter knife to “cut” the marshmallow fluff into the batter. Don't overmix! You want to see some streaks!

  4. Pour the batter into the prepared pan and spread out with clean hands. Add peanut butter chips and torn mini-marshmallows to the top, if desired..

  5. Bake in preheated oven for 25-28 minutes or until a toothpick inserted in the middle of the pan comes out mostly clean. Remove from oven and allow to cool completely on a wire rack before cutting.

Recipe Notes

Fluffernutter Bars will keep for up to 4 days at room temperature (if you can get them to last that long!) or can be frozen for up to 3 months. Defrost in fridge overnight before serving. 

Rewritten but barely adapted from Bakerita via Fresh April Flours.

Super soft peanut butter bar cookies with swirls of marshmallow, these Fluffernutter Bars are a peanut butter lover's dream. 

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