1. Combine mashed sweet potato, sugar, egg, and melted margarine or butter in a mixing bowl. Beat with a fork until smooth. Stir in milk. Set mixture aside.
2. Stir together self-rising flour and baking powder in a large mixing bowl. Cut in shortening until mixture resembles coarse crumbs. Make a well in the center of dry mixture. Add sweet-potato mixture and stir just until combined.
3. Turn out onto a well-floured surface. Knead gently for 10 to 12 strokes. Roll or pat dough to 1/2-inch thickness. Cut with a floured 2-1/2-inch biscuit cutter. Reroll as necessary. Place biscuits 1 inch apart on a large baking sheet.
4. Bake in a 400 degree F oven for 15 to 20 minutes or until the biscuits are lightly browned. Makes 16 to 18 biscuits.
NOTE: To make 1 cup mashed potatoes, peel 2 medium sweet potatoes (about 1 pound total). Cut into 1-1/2-inch chunks. Place in a large amount of boiling water. Simmer about 20 minutes or until very tender. Drain. Mash with a potato masher or beat
with an electric mixer.
