In a large bowl, cream together butter and sugar.Beat in egg and molasses.In a separate bowl, combine flour, soda, salt and spices, and blend into creamed mixture.Shape into small balls and roll in additional sugar to coat.
Place the balls 2 inches apart on a baking sheet lined with parchment.
Bake in 350 degree oven for no more than 8 - 9 minutes, until just set. (They are going to be soft and their tops just slightly cracked at this point, but don't worry - they harden quickly. Removing them at the right time will ensure the perfect chewiness.)