What You'll Need butter (2 sticks of salted butter) 1 cup sugar 1 cup light brown sugar (packed) 3 large eggs 1 ½ teaspoon vanilla extract ¾ teaspoon baking soda ¾ teaspoon salt 3 cups all-purpose flour 1 ½ cup Christmas M&M's (plus about a handful more for topping) 1 cup mini chocolate chips ½ cup white chocolate chips