Fluffernutter Brownies

Fluffernutter Brownies are the ultimate treat for peanut butter, marshmallow, and chocolate lovers. Imagine creamy peanut butter and sweet marshmallow fluff sandwiched and baked between two layers of rich, fudgy brownies. These decadent squares are sure to bring smiles to your face! But first, let’s explore the delightful world of fluffernutters.

What is a Fluffernutter?

A fluffernutter is a simple sandwich made by spreading peanut butter on one slice of bread and marshmallow creme (or fluff) on another, then combining them to form a heavenly treat. The irresistible flavor combination has inspired many delightful desserts, including these brownies!

Ingredients & Substitutions

  • Cocoa Powder: Regular unsweetened cocoa powder forms the base of our double fudge brownies. You can also use Dutch-processed cocoa powder for a darker color.
  • Butter: For fudgy brownies, we use plenty of butter. Melt 2 sticks of unsalted butter with sugar—it’s a crucial step!
  • Espresso Powder: Enhance the chocolate flavor without adding a coffee taste. If you don’t have espresso powder, the brownies will still be delicious.
  • Chocolate Chips: Semi-sweet chocolate chips add extra richness.
  • Peanut Butter: Creamy peanut butter provides that classic fluffernutter texture.
  • Marshmallow Fluff: Not made from actual marshmallows, but it has a similar flavor. Perfect for sweet treats like these brownies.


  1. Prepare the Brownie Layers:
    • Make a batch of double fudge brownies using your favorite recipe. These will serve as the top and bottom layers of our Fluffernutter Brownies.
  2. Create the Fluffernutter Filling:
    • In a small saucepan, combine peanut butter, powdered sugar, corn syrup, and heavy cream. Stir over medium heat until smooth and combined.
    • Pour this luscious mixture over a layer of marshmallow fluff spread in the middle of the brownie pan.
  3. Chill and Slice:
    • Refrigerate until the filling is firm.
    • Remove the brownies from the pan, peel back the foil, and cut them into squares.

Serving and Storage

  • Enjoy these Fluffernutter Brownies as a delightful dessert or share them with friends and family.
  • Store them in an airtight container at room temperature for up to 3 days.
  • To freeze, separate the layers with wax paper or parchment and thaw overnight in the refrigerator when ready to enjoy.


Fluffernutter Brownies combine childhood nostalgia with grown-up indulgence. The creamy peanut butter and marshmallow layers nestled between fudgy brownies create a flavor explosion that’s impossible to resist. So go ahead—take a bite and savor the magic!

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