Preheat your oven to 375°F (190°C). Grease a 9×13-inch baking dish.
Arrange the frozen pierogies in a single layer in the prepared baking dish.
In a mixing bowl, whisk together the sour cream, milk, and melted butter until well combined.
Pour the sour cream mixture evenly over the pierogies in the baking dish.
Sprinkle the shredded cheddar cheese over the top of the pierogies and sour cream mixture.
If desired, sprinkle the diced cooked bacon or ham and chopped green onions or chives over the cheese.
Season with salt and black pepper to taste.
Cover the baking dish with aluminum foil and bake in the preheated oven for 30 minutes.
Remove the foil and continue baking for an additional 10-15 minutes, or until the cheese is melted and bubbly and the pierogies are heated through.
Remove the casserole from the oven and let it cool for a few minutes before serving.
Garnish with chopped fresh parsley, if desired, and serve hot.
Enjoy this comforting and flavorful Cheesy Pierogi Casserole as a satisfying meal for lunch or dinner!
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