Schwarties Hash Browns

Ingredients 2 Lbs. Frozen Hash Browns – 1 kg. 2 Cups Fat-Free Sour Cream – 500 ml. 2 – 10 oz. Cans Mushroom Soup 1/4 Cup Melted Butter 60 ml. Grated Onion & Salt to Taste 2 Cups Grated Light Cheddar Cheese – 500 ml. 2 tbsp. Parmesan Cheese...