INGREDIENTS
2 cups
all purpose flour
1 1/4 tsp
baking soda
1/4 tsp
salt
3/4 cup
unsalted butter, room temperature
2/3 cup
granulated white sugar
2/3 cup
firmly packed light brown sugar
1
large egg, plus 1 yolk
1 1/2 tsp
pure vanilla extract
1 cup
M&M's candies