Peanut Butter Marshmallow Cookies: Easy Sandwich Cookie, Like a Fluffernutter

Easy! Peanut Butter Marshmallow Cookies: take two peanut butter cookies, slather marshmallow crème on one, and mash them together.

Peanut Butter Marshmallow Cookies with The Cookie Elf

It’s the cookie version of the Fluffernutter sandwich, created in the early 1900’s in Massachusetts soon after the invention of marshmallow crème. and originally called the “Liberty Sandwich.” In 1960, an ad agency created the term “Fluffernutter” as a marketing tool.

Today the term “Fluffernutter” is attached to all kinds of recipes that combine peanut butter and marshmallow, including cakes, pie, milk shakes, candy bars and even ice cream.

Prep time: 20 minutes, divided

Bake time: 8-9 minutes

Makes about 30 sandwiches (2 cookies and filling)

Ingredients

2 cup creamy peanut butter (not natural)

2 cup granulated sugar

2 eggs

One 7-ounce tub marshmallow fluff

Directions for Peanut Butter Marshmallow Cookies 

  1. Preheat oven to 350º F. Line baking sheets with silicone baking mats.
  2. In a medium bowl using an electric mixer on medium speed, cream peanut butter and sugar until light and fluffy. Beat in eggs.
  3. Scoop balls with a 1 ½” cookie scoop and place 2 inches apart on the prepared baking sheets. With a fork, press tines over peanut butter balls in a crosshatch pattern, one at a time, to flatten each cookie.
  4. Bake 8-9 minutes until cookies are lightly brown around the edges and appear to have no moisture peeking through crackled tops. Do not over bake. Cookies are best when they are still soft with bottoms that are barely light brown. Remove cookie trays from the oven. 
  5. Allow cookies to sit for 5-10 minutes before using a spatula to transfer them to a wire rack. Let cookies cool completely.
  6. Use a dinner knife or angled spatula to spread 2-3 teaspoons marshmallow fluff on the back of one cookie. Press a second cookie on top to make a sandwich. Repeat with the rest of the cookies.
  7. Store cookies in an airtight container with waxed paper between layers in the refrigerator.

Special Baking Tips for Peanut Butter Marshmallow Cookies

Give cookies plenty of cooling time. They will become more and more firm as they cool. If you remove them from the baking sheets too soon, the cookies may break apart. Let cookies sit on baking sheets until you can safely lift them with a spatula and transfer them to cooling racks without cracking the tops.  

Marshmallow crème is slippery! Too much filling will cause the sides of the cookie sandwich to slide apart. Store in the fridge to keep cookies neat. (If they last.)


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