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fluffernutter bars

Fluffernutter Bars

Fluffernutter Bars are a decadent and fun dessert that tastes like the fluffernutter sandwiches we loved growing up!  A soft peanut butter bar is topped with marshmallow buttercream!
Course Dessert
Cuisine American
Prep Time 10 minutes
Cook Time 25 minutes
Total Time 35 minutes
Servings 15
Author Nichole


  • ¾ Cup Unsalted Butter, Melted
  • 1 Cup Brown Sugar
  • ½ Cup Granulated Sugar
  • 2 Eggs
  • 2 teaspoons Vanilla Extract
  • ¾ Cup Creamy Peanut Butter
  • ½ teaspoon Salt
  • 1 ½ Cups All Purpose Flour


  • ½ Cup Unsalted Butter, Softened
  • 1 7 Ounce Container Marshmallow Fluff
  • 2 Cups Powdered Sugar
  • ½ Cup Chopped Peanuts


  • Preheat the oven to 350 degrees.  Grease a 9x13 inch pan with nonstick cooking spray.  Set aside.
  • In a large bowl, mix together the butter, brown sugar and granulated sugar with a hand mixer until blended.  Add in your eggs and vanilla extract until incorporated.  Add in your peanut butter, and continue to beat until combined.
  • In a bowl, whisk together the salt and flour.  Slowly add to your wet mixture and mix until just combined.
  • Spread into the prepared pan.  Bake for 25 to 30 minutes until golden and a toothpick inserted in the center comes out clean.  Remove the bars from the oven and let cool completely.
  • To make the frosting, in a large bowl beat together the butter and marshmallow fluff.  Add in your powdered sugar 1 cup at a time until blended.
  • Spread the frosting on the bars, and sprinkle peanuts on top.