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Fluffernutter Bars

  • Author: Kayla Berman
  • Prep Time: 15 Minutes
  • Cook Time: 20 Minutes
  • Total Time: 35 minutes
  • Yield: 9 Bars 1x
  • Category: Dessert
  • Method: Baked


Fluffernutter Bars are soft & chewy peanut butter cookie bars full of big ooey-gooey, melty marshmallows! This easy dessert recipe is the ultimate salty-sweet treat and will be gone before you even know it. A delicious take on the classic sandwich!




  1. Set the oven to 350 degrees.
  2. To a large mixing bowl add the butter and peanut butter.  Combine evenly.
  3. In a separate bowl whisk the egg for a few minutes until bubbly and foamy.  Add the whisked egg, vanilla, and light brown sugar to the peanut butter mixture.  Mix until combined.
  4. Next add in the flour, baking powder, and salt.  Combine.
  5. Transfer the mixture to a parchment paper lined 8×8 baking dish.  Flatten the dough and add the marshmallows on top.  Push the marshmallows into the dough. (See tips!)
  6. Bake for 20 minutes.
  7. Let cool completely, cut into squares, & enjoy!

Keywords: Fluffernutter Bars, Fluffernutter Cookie Bars, Peanut Butter Marshmallow Cookie Bars