1 cup ( 2 sticks of butter) softened 1/2 cup of granulated sugar 1 cup of light brown sugar 2 large eggs 1 1/2 tsp of vanilla extract 3 cups of all purpose flour 2 tsp cornstarch 1 tsp baking soda 1 tsp baking powder 1/4 tsp salt 2 cups of M&M's stand mixer with paddle attachment medium mixing bowl and hand whisk cookie scoop baking sheets cooling racks

Set out the two sticks of butter to get to room temperature for 45 minutes.
Place the butter, granulated sugar, and brown sugar in the bowl of your stand mixer, and beat for 2-3 minutes until light and fluffy.
Add the eggs, and vanilla extract to the bowl. Beat until thoroughly mixed , scrape down the sides of the bowl to make sure it is all incorporated .
In a medium bowl mix the flour, cornstarch, baking soda, baking powder , and salt until fully combined.
Add half the dry mixture to the wet mixture and mix until combined, add the remaining ingredients . Then fold in the m&ms by hand.
Scoop out two tablespoons of dough onto cookie sheet, and repeat until all the dough is gone. Make sure to place the cookies 2" apart.
Heat the oven to 350 f
Bake one sheet of cookies at a time for 10-12 minutes, or until the edges are lightly browned .
cool the cookies on the sheets for 3 minutes, add to cooling racks . once fully cooled add to air tight containers for 2 weeks.