This is the Best Monster Cookies Recipe in the world. They are soft and chewy and loaded with m&ms. One of our favorite cookies!
Preheat oven to 350 degrees. Line two baking sheets with parchment paper.
In a large bowl, cream butter, peanut butter, brown sugar, and granulated sugar together until light and fluffy. Stir in eggs and vanilla. Scrape the sides and stir again briefly.
Stir in flour, baking soda, salt, and oats until just incorporated. Do not overmix. Stir M&Ms in by hand.
Scoop cookie dough with a 2 tablespoon cookie dough scooper and add to parchment paper lined baking sheets.
Bake at 350 for 8-9 minutes until edges are golden brown. Cool on the baking sheet for 3 minutes, then move to wire rack to continue cooling.