Cook pork: In a large skillet, brown the ground pork or sausage over medium-high heat. Drain off any excess grease.

Sauté onion and garlic: Add the onion and garlic to the skillet and cook until softened, about 5 minutes.

Combine ingredients: In a large bowl, combine the cooked pork, onion, garlic, cream of mushroom soup, sour cream, milk, Parmesan cheese, and melted butter.

Layer casserole: In a 9x13 inch baking dish, layer the thawed pierogies and the creamy sauce mixture. Sprinkle with breadcrumbs and shredded cheddar cheese.

Bake: Bake in a preheated oven at 375°F (190°C) for 30-45 minutes, or until bubbly and golden brown.

Tips:

For a richer flavor, use a combination of ground pork and sausage.

You can use frozen or fresh pierogies for this recipe.

Serve with a side of sour cream or a dollop of homemade sauerkraut.

Enjoy your delicious and comforting pierogi casserole!