INGREDIENTS
2 1/4 cups
all-purpose flour
1 tsp
baking soda
1 tsp
corn starch
1/2 tsp
salt
1 tbsp
vanilla extract
3/4 cup
unsalted butter
1 cup
brown sugar
1/2 cup
white sugar
1
egg, plus 1 egg yolk, room temperature
2 cups
semi-sweet chocolate chips