Coconut Oatmeal Cookie Sandwich

To make the cookie sandwich heavenly, these cookies are stuffed with some creamy coconut buttercream marshmallow filling.
Course Cookies
Cuisine American
Keyword Coconut, cookie sandwich, oatmeal, oatmeal cookies
Prep Time 1 hour 30 minutes
Cook Time 12 minutes
Total Time 1 hour 42 minutes
Author Lyuba Brooke


  • Cookies:
  • 1 cup unsalted butter room temperature
  • ½ cup brown sugar
  • ½ cup white granulated sugar
  • 2 eggs room temperature
  • 1 cup all purpose flour
  • 2 tsp vanilla extract
  • 1 vanilla bean
  • 1 tsp baking soda
  • Pinch of salt
  • 3 cups quick oats
  • 1 cup sweetened coconut flakes
  • Frosting:
  • 1/2 cup unsalted butter
  • 2 Tbsp heavy whipping cream
  • 1 cup powdered sugar
  • 7 oz marshmallow fluff
  • 1/2 cup sweetened coconut flakes


  1. Preheat oven to 375 and line a cookie baking sheet with parchment paper.
  2. Beat butter on medium-high speed until light and fluffy. Add both sugars and beat for another minute.
  3. Add eggs, one at a time, mixing well after each addition. Scrape sides and bottom of the bowl.
  4. Lower the speed to slow and add vanilla extract, flour, baking soda and salt. Scrape out vanilla beans and it to the batter. Mix it in on low speed until just until incorporated.
  5. Add oats and coconut flakes, while still on low speed, just until incorporated.
  6. Scoop cookie dough onto the prepared cookie sheet, using a cookie scoop (#50 scoop will work well).
  7. Bake for 10-12 minutes, until golden.
  8. Cool cookies completely on the wire rack before adding the filling.
  9. Filling:
  10. Using a whisk attachment, beat butter on medium-high speed until light and fluffy. Pour in heavy cream while still beating the butter. Beat until all incorporated and light. Lower the speed to low and add powdered sugar and marshmallow fluff. Beat of low until sugar is incorporated and raise the speed to medium-high. Beat for about a minute and add coconut flakes. Beat until incorporated throughout. Set aside until ready to fill the cookie sandwich.
  11. Once the cookies are cooled completely, scoop some filling into one cookie and cover it with another cookie.

Recipe Notes

Recipe from Lyuba @ All images and content are copyright protected. Please do not use my images without prior permission. If you want to share this recipe, please simply link back to this post for the recipe. Thank you.