INGREDIENTS
2 cups
flour
1/2 tsp
baking soda
1/2 tsp
salt
1/2 tsp
corn starch
1
Tbls vanilla
3/4 cup
unsalted butter
1 cup
brown sugar
1/2 cup
white sugar
1
egg, plus 1 egg yolk, room temperature
1 cup
semi-sweet chocolate chips or milk chocolate chips or a combination of chips
1 cup
Heath toffee bits