Incredibly soft — we dare say they are the best oatmeal cookies. Packed with grounded oats and M&M's and so easy to make!
Preheat over to 350 degrees. Microwave butter for 35 seconds.
Add all dry ingredients (except M&M's) to a large bowl and whisk until thoroughly combined.
In a large bowl, cream butter and sugars until creamy and smooth; about 1-2 minutes. Beat in egg and vanilla for 15 seconds. Scrap down sides as needed.
Add dry mixture to wet mixture and mix until crumbles form. Press together using your hands until a dough forms. Add M&M's and incorporate with your hands.
Roll dough into 16-20 balls and place on a cookie sheet. Bake for 9-11 minutes. Let cool for 30 minutes on the pan. Enjoy!