Stir in the chocolate chips and white chocolate chips. Roll into balls and place on a baking sheet a few inches apart. Bake for 7-10 minutes, until the tops are just set (not wet-looking anymore), the cookies are evenly flattened, and they are starting to get cracks in them. If the cookies are done, they should come off the pan relatively easily with a spatula. If the cookies are not holding together, you probably need to bake them a little longer. Remove from the baking sheet and let cool for a few minutes before serving.