Classic Polish Pierogi with Potato and Cheese Filling

Method

1. In a bowl, mix grated potatoes, crumbled cheese, onion, butter, salt, and pepper.
2. In a separate bowl, combine flour, egg, and water to make a dough. Knead until smooth, then let rest for 10 minutes.
3. Roll out the dough and cut into circles. Place a spoonful of the filling in the center, fold, and seal the edges.
4. Bring a pot of salted water to a boil, add the pierogi, and cook for 5-7 minutes until they float.
5. Serve with sour cream and fried onions.