Whisk together dry ingredients in a large mixing bowl and set aside.
In a separate bowl, mix together butter and both sugars, until just mixed and most of butter has blended, but don’t over mix the butter. You want the butter to remain as cold as possible.
Mix in the rest of the wet ingredients.
Mix half of the dry ingredients into the bowl of wet ingredients. Once that is incorporated, mix in the rest.
Toss the M&Ms in a little bit of flour.
Fold the M&Ms into the cookie dough.
Portion out 6 Tablespoons worth of dough per cookie onto a lined baking sheet, leaving plenty of space between each one. We did 4-5 cookies per pan.
Bake at 350 degrees Fahrenheit for 17 minutes.
Notes
Nutrition information is an estimate only.Pro Tip: Press extra holiday M&Ms on top before baking for picture-perfect cookies. Yield: Makes about 16 large bakery-style cookies. Storage: Store in an airtight container at room temp 4–5 days, or freeze baked cookies up to 3 months. Thaw before serving. Variations: Add ½ cup chopped dark chocolate for extra richness. Chilling: Chill dough at least 3 hours (or overnight) to keep cookies thick and prevent spreading. Make Ahead: Freeze dough balls up to 2 months; bake from frozen, adding 1–2 minutes to bake time.