M&M Oatmeal Monster Cookie Sandwiches

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!