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Preheat oven to 400 degrees. In a large mixing bowl, cream butter, brown sugar, and sugar for 4 minutes until light and fluffy.
Add eggs and vanilla. Mix for 1 minute longer.
Stir in flour, cornstarch, baking soda, and salt. Mix just until combined. Fold in M & M's.
Scoop cookie dough onto baking sheets. I suggest using parchment paper or Silpat silicone baking sheets on light-colored baking sheets. Place extra M & M's on top of cookie dough balls so the M & M's show up after baking.
Bake for 9-11 minutes or until the edges just begin to turn a light golden color. Remove from oven and let set for 5 minutes before removing from the cookie sheet.
Nutrition information is automatically calculated, so should only be used as an approximation.
I hope you love these homemade M & M cookies! Happy Baking!
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