With the same batch of cookie mixture, you can bake this cookie either soft and chewy or crispy and crunchy. All you need to adjust is the baking time and how long you leave the cookies in the hot tray.
I notice that the Americans seem to like their chocolate chip cookies soft and chewy. While the Asians like them dry and crunchy. You don't actually need to follow the measurement in the recipe for the chocolate chips. Just add as much as you want :)