Creating your Dump-and-Bake Meatball Casserole is as easy as following these steps:

1. Preheat Oven: Preheat your oven to 375°F (190°C).
2. Prepare Baking Dish: Lightly grease a 9×13-inch baking dish with cooking spray or olive oil.
3. Combine Ingredients: In a large bowl, combine frozen meatballs, uncooked pasta, marinara sauce, water, and Italian seasoning. Season with salt and pepper to taste.
4. Transfer to Baking Dish: Pour the mixture into the prepared baking dish and spread it evenly.
5. Add Cheese: Sprinkle shredded mozzarella cheese and grated Parmesan cheese on top of the mixture.
6. Cover and Bake: Cover the dish tightly with aluminum foil and bake for 30 minutes.
7. Remove Foil: After 30 minutes, remove the foil, and bake for an additional 10-15 minutes or until the cheese is melted and bubbly.
8. Cool Slightly: Once done, take the casserole out of the oven and let it cool for a few minutes before serving.
9. Garnish: If desired, sprinkle fresh parsley on top for added flavor and a touch of color.

These straightforward steps will guide you to a delicious casserole that’s both satisfying and easy to prepare!