Potato and Cheese Pierogi with Fried Crust

Method

1. In a bowl, mix flour, egg, milk, and salt to form a dough. Knead until smooth, then let rest for 30 minutes.
2. Boil potatoes until tender, then mash them with cheese, onion, salt, and pepper.
3. Roll out the dough and cut into circles. Fill each with the potato-cheese mixture.
4. Boil the pierogi for 3-4 minutes until they float, then drain.
5. In a pan, melt butter and fry the pierogi until golden brown.
6. Serve hot with sour cream or fried onions.