Ingredients
1 1/3 cups all-purpose flour
1 tsp cornstarch
1/4 + 1/8 tsp baking soda
1/4 tsp salt
1/2 cup unsalted butter
1/2 cup packed light-brown sugar
1/4 cup granulated sugar
1 large egg
1 1/2 tsp vanilla extract
2/3 cup mini semi-sweet chocolate chips, plus more for topping if desired