Lucky Charms Marshmallow Cookies

Stuffed with crushed bits of cereal, marshmallow fluff and chunks of toasted marshmallow, these quick and easy cookies are perfect for weeknight baking.

  • Author: Claire | The Simple, Sweet Life
  • Prep Time: 25 minutes
  • Cook Time: 11 minutes
  • Total Time: 36 minutes
  • Yield: 15 1x
  • Category: Dessert
  • Method: Baking
  • Cuisine: American


Units Scale
  • 3/4 cup cereal, crushed
  • 1 cup flour
  • 1 tsp vanilla extract
  • 1/2 tsp baking soda
  • 1/4 cup brown sugar
  • 1/2 cup granulated sugar
  • 1/2 cup butter, at room temperature
  • 1 egg
  • 2/3 cup Lucky Charms marshmallows
  • 1/2 tsp salt
  • 5 marshmallows, cut in thirds
  • 1/2 cup marshmallow fluff


  1. In a bowl, cream the butter until smooth.
  2. Beat in the brown sugar, granulated sugar, vanilla extract and egg until free of large lumps.
  3. Beat the dry ingredients (flour, cereal, baking soda and salt) into the batter until just combined.
  4. Fold in the Lucky Charm marshmallow pieces.
  5. Using 1-2 tablespoons at a time, fold marshmallow fluff into the batter, scooping out one tablespoon balls of dough between each new addition onto a parchment paper lined baking sheet.
  6. Place the baking sheet of scooped cookies into the refrigerate to chill for about 15 minutes.
  7. Place six cold balls of dough onto a baking sheet.
  8. Using your thumb or the back of a spoon, create a shallow indent in the top of each cookie.
  9. Place a piece of marshmallow in the indent.
  10. Bake at 350F for 10-11 minutes, or until the cookie dough is no longer shiny.
  11. Remove from the oven and allow to cool on the baking sheet for 2-3 minutes before moving to a cooling rack.


  • Estimating the amount of cereal needed: I found it took a little over a cup of whole cereal pieces to create 3/4 cup of crumbs.
  • Marshmallow fluff placement: As you scoop the dough onto the cookie sheet, you’ll want the majority of the marshmallow fluff to be on the top of the cookies. This will help it brown and will keep the cookies from spreading too much.
  • Substituting mini marshmallows: If you want to use mini marshmallows instead of full size ones, you can use 2-3 mini marshmallows in place of the 1/3 marshmallow that tops each cookies.
  • The importance of leaving cookies on the baking sheet: The goal of taking the cookies out when they’re no longer shiny is to keep them from becoming too browned or drying out. At this point, they’ll be slightly under-cooked, and leaving them on the hot baking sheet allows them to finish cooking through without browning further.
  • Toasting marshmallows: If you like a really toasty marshmallow, you can further toast them using a culinary torch.

Keywords: lucky charms marshmallow cookies, cereal cookies, marshmallow cookies