2 T light brown sugar
Preheat oven to 400 degrees. Sift together flour, baking powder, and salt. Combine brown sugar, melted margarine, and sweet potatoes in a small bowl, best until fluffy. Stir soda in buttermilk. Combine all ingredients. Stir only until moist. Turn out on a floured surface. Knead slightly. Roll out and cut into biscuits. Bake on ungreased baking sheet for 20 minutes or until done.