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OMG Peanut Butter Marshmallow Cookies
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4.37 from 30 votes

OMG Peanut Butter Marshmallow Cookies

Hello! Big, soft peanut butter cookies loaded with toast marshmallows, Reese's Peanut Butter Cups, rich milk chocolate and peanut butter chips! Trust me, these cookies are not going too last long!
Prep Time15 mins
Cook Time10 mins
Course: Dessert
Keyword: chocolate chip, cookies, marshmallow, peanut butter
Servings: 18 Cookies
Author: Kim Lange


  • ¾ cup unsalted butter, softened
  • ¾ cup granulated sugar
  • 1 cup brown sugar
  • 1 cup peanut butter creamy or crunchy
  • 2 large eggs
  • 1 tablespoon vanilla extract
  • 2 ½ cups all-purpose flour
  • 1 teaspoon baking soda
  • ½ teaspoon salt
  • 1 ½ - 2 cups mini marshmallows
  • 1 bag of Mini Reese’s Peanut Butter Cups chopped coarsely
  • 1 cup Reese’s Peanut Butter Chips
  • 1 cup Ghirardelli Milk Chocolate Chips


  • Preheat the oven to 350F.
  • Using a mixer, mix the butter, sugars, peanut butter, eggs and vanilla together until combined.
  • Add in the flour, soda, and salt in and mix until just combined.
  • Fold in chocolate chips, peanut butter chips, chopped pb cups and marshmallows.
  • Using an ice cream scoop, scoop the dough onto parchment on cookie sheets. (6 per sheet, these will be large, jumbo cookies!) You can roll these into balls if you wish as well.
  • Use your hand and slightly flatten each scoop of dough.
  • Cook for 10-12 minutes at 350.  If your dough is chilled, allow a few more minutes for baking.
  • Remove cookies from oven and cool on baking sheet 5-10 minutes before placing on cooling rack.
  • Makes 18 large cookies