Boil water in a medium saucepan. Add potatoes cook until tender, but firm. This should be about 15 minutes.
Drain, and immediately submerge in cold water to loosen the potato skins. Drain, remove skins, chop, and mash.
In a medium bowl, sift together flour, baking powder, salt, nutmeg, and cinnamon.
Mix mashed sweet potatoes, eggs, milk, and butter in another medium bowl.
Form a batter by blending the sweet potato mixture into the flour mixture.
Preheat a lightly greased pan over medium-high heat. Drop batter onto the prepared pan by heaping tablespoonfuls, and cook until golden brown. Turning once with a spatula when bubbles appear on the surface.