The key to the crispy edges and chewy center is the extra large cookie. A generous three tablespoons of dough goes into each cookie and it makes a difference in the results. I tried making them smaller and I'll tell you now that you'll miss the chewy center when you do that.
Part of what makes these cookies extra special is rolling them in raw sugar just before baking. They will still be crisp, chewy, and delicious without that step, but for an unexpected treat, the crunchy sugar is perfect.