Ukrainian Potato Varenyki

Method

1. 1. Boil the potatoes until tender, then mash them.
2. 2. In a pan, sauté the onion in butter until soft.
3. 3. Mix the mashed potatoes, sautéed onion, salt, and pepper.
4. 4. In a separate bowl, mix flour, egg, sour cream, and milk to form a dough.
5. 5. Knead the dough until smooth, then let it rest for 30 minutes.
6. 6. Roll out the dough and cut into circles.
7. 7. Place a spoonful of potato mixture in the center of each circle.
8. 8. Fold the dough over and pinch the edges to seal.
9. 9. Boil the varenyki in salted water until they float, then serve with sour cream or butter.