INGREDIENTS
3/4 cup
unsalted butter, softened
3/4 cup
light brown sugar, packed
1/4 cup
granulated sugar
1
large egg
2 tsp
vanilla extract
2 cups
all-purpose flour
2 tsp
cornstarch
1 tsp
baking soda
1/2 tsp
salt, or to taste
1 3/4 cups
mini semi-sweet chocolate chips
1 cup
mini marshmallows