This sweet potato pierogi recipe is a dessert pierogi. The filling also is ideal for any type of filled dumpling or crepe (nalesniki, pierogi, and uszka). Sweet potatoes are available year-round now, but this would make a delightful dessert for fall and winter dinners and holidays. After boiling these, saut them in butter until they have a blush of golden color. Then sprinkle them with cinnamon sugar.