M&M Oatmeal Monster Cookie Sandwiches

18 Servings
1 hr 10 min

These M&M oatmeal monster cookie sandwiches are the perfect snack and are easy to whip up! They are also a great way to use up extra seasonal M&M candies if you have them laying around. You can customize these for any holiday. Or, make them just because! Between each soft-baked oatmeal monster cookie is a scoop of silky cream cheese frosting for extra deliciousness! Get creative with your add-ins for these cookies too! Chocolate chips, nuts or even sprinkles would make these a super fun treat! If you want the perfect chewy and pillowy oatmeal monster cookie, be sure to refrigerate your dough first before baking! Trust me, you will want these in your cookie recipe archives.

M&M Oatmeal Monster Cookie Sandwiches

Recipe details

  • 18  Servings
  • Prep time: 1 Hours Cook time: 10 Minutes Total time: 1 hr 10 min
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Ingredients

For the M&M Oatmeal Monster Cookies

  • 3/4 cup unsalted butter (1½ sticks at room temperature)
  • 1½ cups brown sugar
  • 1 large egg (room temperature)
  • 2 tsp vanilla extract
  • 1½ cups all-purpose flour
  • ½ tsp baking soda
  • ½ tsp baking powder
  • ½ tsp salt
  • 2 cups old fashioned oats (uncooked)
  • 2 cups M&M's

For the Cream Cheese Frosting

  • 4 oz full fat cream cheese (room temperature)
  • ½ cup unsalted butter (room temperature)
  • 3½ – 4 cups powdered sugar (depending on the thickness you want!)
  • 1 tsp vanilla extract
  • 1/2 tsp salt

Instructions

For the M&M Oatmeal Monster Cookies

Preheat oven to 325°F. Line large baking sheets with parchment paper and set aside.
In the bowl of a stand mixer fitted with a paddle attachment, or in a large bowl with a hand mixer, beat the butter and sugar on medium-high speed until light and fluffy (about 2 minutes).
Add the egg and vanilla and beat until well incorporated (about 1 minute).
Add the flour, baking soda, baking powder and salt. Mix on low speed until just combined, but do not overmix. Scrape down the sides of the bowl with a spatula as needed.
Add the oats and mix on low speed until just combined. Fold in the M&M's until just combined, but do not overmix.
Using a 1 tablespoon cookie scoop, create cookie dough balls and place on a plate or baking sheet and chill in the refrigerator for 30 minutes or overnight.
Remove cookie dough balls from the refrigerator and place on prepared baking sheets, leaving 2 inches between each cookie.
Bake for 10 – 11 minutes, or until the edges are browned and the centers are set. Remove baking sheet from oven and cool cookies in the pan for 5 minutes on a wire rack. Remove cookies from pan and finish cooling on wire rack.

For the Cream Cheese Frosting

In the bowl of a stand mixer fitted with the paddle attachment, or in a large bowl with a hand mixer, beat the butter and cream cheese on medium-high speed until combined. Add in the vanilla and salt and mix until combined.
Slowly add the powdered sugar and mix on low speed until combined. Increase mixer to medium-high speed and beat until light and fluffy.
If frosting is too thick, add milk 1 tablespoon at a time until desired consistency is reached.
Using a 1 tablespoon cookie scoop, place dollops of frosting onto a cooled cookie, and then sandwich using another cookie. Squeeze until frosting reaches the edges of the cookie. Repeat with remaining cookies and enjoy!

Tips

  • If you have leftover cream cheese frosting, place in an airtight container and store in the freezer for up to 3 months.
  • Cookies can be stored in an airtight container in the refrigerator for up to 5 days.

Amy Manes
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Comments

  • Sara Litke Sara Litke on Aug 05, 2020

    I made these today and they were INSANE! I made them gluten free, replacing the oats with gluten free oats and the flour with Bob’s Red Mill gluten free flour. They were absolutely a hit and the frosting reminded some people of Dunkaroos! Thank you for a great recipe!

    • Amy Manes Amy Manes on Sep 14, 2020

      This is the best I am so glad that the cookies were a hit! Even with the substitutions too! So happy you enjoyed them :) There will be a Halloween version coming soon!

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