sentences:  Chocolate chip cookies are commonly made with white sugar; brown sugar; flour; a small portion of salt; eggs; a leavening agent such as baking soda; a fat, typically butter or shortening; vanilla extract; and chocolate pieces.Some recipes also include milk or nuts (such as chopped walnuts) in the dough.Depending on the ratio of ingredients and mixing and cooking times, some recipes are optimized to produce a softer, chewy style cookie while others will produce a crunchy/crispy style.