Creamy, comforting potato pierogi filling made with russet potatoes, butter, and American cheese—simple, traditional, and perfect for sealing inside tender pierogi dough.
Optional: 1 medium onion, finely diced and sautéed in butter
Instructions
Peel the potatoes and cut them into roughly 1-inch cubes so they cook evenly. Place in a large pot, cover with cold water, and bring to a boil. Cook until fork-tender, about 15–20 minutes.
Drain the potatoes thoroughly, letting them sit in the colander for at least 5 minutes. Return the potatoes to the warm pot.
While the potatoes are still warm, add the butter and broken-up American cheese slices. Begin mashing with an electric mixer, add the milk one tablespoon at a time, if needed, until the mixture is smooth and creamy and the cheese is fully melted. The mixture should be very stiff, but still mixable, so you may not need all four tablespoons.
Season with salt to taste.
Optional: Stir in sautéed onions for extra depth of flavor.
Place the filling in a suitable bowl, cover it, and refrigerate it overnight before using it in pierogi.
Notes
Refrigerating for at least 8 hours is essential. Warm filling will soften the dough and make the pierogi harder to seal.