– 1 cup of salted butter, room temperature (2 sticks) – 1 cup granulated sugar – 1 cup light brown sugar – 3 eggs, large and at room temperature – 1 1/2 teaspoons vanilla extract – 3 cups all purpose flour – 1 teaspoon baking soda – 1/2 teaspoon salt – 1 1/2 cups M&M milk chocolate candies (plus more for topping after baking) – 3/4 cup semi-sweet chocolate chips (plus more for topping after baking) – 3/4 cup white chocolate chips (plus more for topping after baking)