Pierogi with Potato and Cheese

• 2 lbs russet potatoes, peeled and cooked
• 1 cup dry curd cottage cheese (or farmer's cheese)
• 2 large onions, finely chopped
• 3 cups all-purpose flour
• 1 large egg
• 4 tbsp butter
• Sour cream for serving
• 1 tsp salt

Instructions

1. 1

   Boil and mash potatoes.

2. 2

   Add sautéed onions and cheese to potatoes.

3. 3

   Make dough, rest.

4. 4

   Form dumplings.

5. 5

   Boil until distinct.

6. 6

   Toss in butter. Serve.