Whisk together the flour, cornstarch, baking soda, and salt in a small mixing bowl. In a separate large mixing bowl, cream together the butter, granulated sugar, and light brown sugar. Add the eggs and vanilla extract and beat until smooth. Gradually beat in the dry ingredients. Then, fold in the chocolate chips and place the cookie dough in the freezer for about 10 minutes to firm up.
1 cup + 2 tablespoons (135 grams) bread flour, ½ teaspoon baking soda, 1 teaspoon cornstarch, ¼ teaspoon salt, 1 stick unsalted butter, ⅓ cup light brown sugar, ⅓ cup granulated sugar, 1 large egg, 1 teaspoons vanilla extract, ½ cup semi-sweet chocolate chips