Combine Ingredients: In a greased slow cooker, combine kielbasa, hash browns, onion, and 1 cup of cheddar cheese.
Prepare Sauce: In a separate bowl, mix cream of mushroom or chicken soup, milk, sour cream, salt, pepper, garlic powder, and onion powder.
Assemble and Cook: Pour the sauce mixture over the kielbasa and hash brown mixture. Sprinkle with remaining 1 cup of cheddar cheese. Cook on low for 6-8 hours or high for 3-4 hours.
Serve: Serve with a side salad or roasted vegetables.
Optional: For added flavor, consider adding other vegetables like bell peppers or broccoli.
