Pierogi Casserole | Recipe Cart

Ingredients

• 1 large egg
• 8 tablespoons unsalted butter, softened, plus more for the baking dish
• 3/4 cup sour cream, plus more for serving
• 1 tablespoon chopped fresh chives, plus more for garnish, optional
• 1 teaspoon kosher salt
• 2 cups all-purpose flour, plus more for rolling the dough
• 2 pounds russet potatoes, peeled and cut into large chunks
• Kosher salt
• black pepper
• 1 cup heavy cream, heated until hot
• 8 tablespoons cold butter, cubed
• 1 tablespoon olive oil
• 1 pound bacon, chopped
• 2 large yellow onions, thinly sliced
• 1 1/2 cups shredded Gruyere
• 1 1/2 cups shredded farmer's cheese