1cup (2 sticks)unsalted buttersoftened to room temperature
3/4cupdark brown sugar
1cupmilk chocolate chips
Preheat your oven to 350° and line a rimmed metal baking sheets with parchment or silicone mats.
Combine oats, flours, baking soda and salt in a bowl. Then set off to the side.
In the bowl of your stand mixer, fitted with the padle attachment, add the softened butter, peanut butter and both sugars. Mix until ight and creamy.
Add in one egg at a time, adding 1 teaspoon vanilla extract with the final egg.
Then add in half of the oat and flour mixture, mixing until just combined. Repeat with the remaining oat/flour mixture.
Mix in the chocolate chips and then fold in the M&M's by hand using a spatula.
Use a 3-tablespoon scoop to measure out each cookie. Space 10 scoops of cookie dough a few inches apart on the prepared pan. Bake on the middle rack of your preheaetd oven for 12 to 14 mintues (rotating halfway through).
Once the edges are golden, remove and transfer to a wire cooling rack and repeat with remaing dough.