Chop the yams and place on a large baking pan.

In a small pan, melt the butter, then add the sugar and stir. Remove from heat. Add all remaining spices, and then the vanilla, stir well.

Pour the sugar mixture over the yams, and then mix very well.

Cover with foil, and bake for 30 minutes. Remove the foil, bake a final 15 minutes. Enjoy!