Grease a 9×13 inch baking or bowl and preheat the oven to 350 Fahrenheit.
Melt the butter over medium heat in a medium saucepan.Stir in the heavy cream, Parmesan cheese, tomato paste, parsley, oregano, basil, salt, and pepper.Cook it. Keep it stirring frequently until the cheese melts and sauce is smooth.
Now in the baking dish arrange uncooked pasta, frozen meatballs, sauce, and water. Bake for 30 minutes or until sauce is bubbly.
Sprinkle the mozzarella cheese over the casserole and bake it for additional 5 minutes. Dump and bake meatball casserole is ready. Enjoy!!