These M&M Chocolate Chip Cookies have chewy, gooey, soft centers with crisp edges and are packed with m&ms. This is a no chill cookie recipe that's made in 30 minutes flat!
Preheat the oven to 350 degrees F. Add butter to the bowl of a stand mixer fitted with the paddle attachment. Cream butter on medium speed for 2 minutes, then add brown sugar and white sugar and cream together for 3 minutes. Scrape down the sides of the bowl and add egg and egg yolk. The mixture may appear soupy at first. Simply scrape down the sides of the bowl again and continue to mix until fluffy, about 2 minutes. Add vanilla extract and mix until combined.
In a large bowl, whisk together all purpose flour, baking soda, kosher salt, and nutmeg. Add to the wet ingredients and mix until just combined, about 30 seconds.
Remove the bowl from the stand mixer and use a rubber spatula to fold in the m&ms and semi-sweet chocolate chips.
Line a baking sheet with parchment paper and use a large cookie scoop to scoop out the cookie dough and place onto the baking sheet. Roll each cookie into a ball and place any leftover m&ms on top of the cookie. Bake about 6 cookies at a time, spacing the cookies about 2 inches apart.
Bake for 11-13 minutes; 11 minutes for a soft gooey cookies and 13 minutes for a crisper cookie.
Allow the cookies to cool in the pan for 10 minutes, then place onto a wire rack to cool completely.