How can I bake crunchy chocolate chip cookies?
The best way to achieve what you are looking for is to lower the temp and lengthen the baking time. Lowering the temp will slow the edges from getting burned while the center is allowed to continue to cook.

Allow the top of the cookie to brown before removing from the oven. For soft cookies, the moment it starts to turn brown is the moment you are just a little too late for the cookies to stay soft after they've cooled. If you let the cookie brown just a touch, the cookie will harden on the cooling rack.