Preheat your oven to 375°F (190°C).

In a large mixing bowl, combine the sliced kielbasa sausage, peeled and diced potatoes, shredded cheese, sour cream, and cream of mushroom soup. Add in garlic powder, onion powder, salt, and pepper. Mix thoroughly until well combined.

Transfer the mixture into a greased baking dish and spread it evenly.

Bake for about 1 hour, until the top is golden brown and the potatoes are fork-tender.

Let the casserole cool for about 10 minutes before serving.

Sprinkle chopped parsley on top before serving for a fresh touch.