Preheat oven to 450˚F

Bake and mash the sweet potatoes (use a fork to mash). In a bowl mix the sweet potato, milk and butter. Sift the dry ingredients together in a large mixing bowl. Add the dry ingredients to mashed sweet potato wet mixture.  Gradually mix until the ingredients are evenly dampened and a soft dough is formed.

Drop dough by tablespoon fulls on a baking sheet. Place them about 2 inches apart on an ungreased baking sheet.

Bake in oven for 12 to 15 minutes or until biscuits are lightly brown on top and appear flaky.
Cool slightly on a rack. Serve warm with butter.