Potato Pierogis

Name: Potato Pierogis
Prep time: 1 h 45 min
Cook time: 45 min
Total time: 2 h 30 min
Yield: 8
Ingredients: Ingredients; 3 cups all-purpose flour; 1 large egg; 1/2 cup sour cream; 4 tablespoons butter, melted; 1 teaspoon salt; 3-4 tablespoons warm water (as needed); 2 lbs russet potatoes, peeled and cubed; 1/2 cup butter; 1 medium onion, finely diced; 8 oz cream cheese, softened; 1 teaspoon salt; 1/2 teaspoon black pepper; 2 tablespoons fresh chives, chopped; Serving; 3 tablespoons butter; 1 large onion, sliced; 1/2 cup sour cream; Fresh parsley for garnish