That's how I always buy my meatballs.

They're good for a quick meal or when I've forgotten to get something out.
We really like meatball sandwiches for a weekend lunch or a light dinner.....served with fried onions & peppers and a salad.
The first time I saw this one I thought it sounded kind of odd. However, it's become a favorite around here.
Meatball casserole
20 meatballs
1 lb Italian bread
28 oz spaghetti sauce
1 c water
2 cloves garlic, diced
8 oz cream cheese, softened
½ c mayonnaise
1 tsp Italian seasoning
¼ tsp pepper
2 c mozzarella cheese
Defrost meatballs in microwave for 5 min. Cut bread into 1 slices. Place bread in ungreased 13"x9" dish. Combine cream cheese, mayonnaise, Italian seasoning & pepper; spread over bread. Sprinkle with ½ c mozzarella. Combine sauce, water & garlic; add meatballs. Pour over cheese mixture; sprinkle with remaining mozzarella. Bake uncovered at
350 for 30 minutes. (Although cream cheese may be lite version, mayo cannot.) Serves 6-8
Meatball Stuffed French Loaf
Serving Size: 8
1½ lb ground beef
½ lb ground pork
2 eggs
½ c fine dry breadcrumbs
½ c grated Romano cheese
5 Tbl chopped parsley
½ tsp salt
1 pkg dry spaghetti sauce mix with mushrooms
2 Tbl butter
8 oz tomato sauce
½ c water
1 round loaf French bread
Grated Romano cheese
Combine beef, pork, eggs, bread crumbs, cheese, 4 tablespoons parsley, salt and 2 tablespoons dry sauce mix. Shape into 20-24 balls, about 1½" in diameter. In a wide frying pan over medium heat, melt 1 tablespoon butter. Add ½ of meatballs and cook, shaking pan to brown meatballs on all sides. Remove and set aside. Melt the remaining butter, brown remaining meatballs, remove from pan and set aside. Discard any pan drippings, then add remaining dry sauce mix, tomato sauce, and water. Heat until bubbly. Return meatballs to pan, cover and simmer 25 minutes. Meanwhile, cut off top third of bread and scoop out insides, leaving shell about 1" thick. Heat in 350 degree oven for 10 minutes. With slotted spoon, transfer meatballs into warmed bread. Garnish with remaining 1 tablespoon parsley.
Meatballs Hawaiian
Serving Size : 4
1 lb ground beef
½ tsp salt
¼ tsp ground ginger
1 egg
1 tsp water
¼ c flour
3 Tbl vegetable oil
14 oz pineapple chunks in juice
¼ c firmly packed brown sugar
2 Tbl cornstarch
¼ c cider vinegar
1 Tbl soy sauce
2 green peppers -- seeded, cut in strip
Hot cooked rice
Mix ground beef lightly with salt and ginger. Shape into 16 balls. Beat egg slightly with water. Dip balls in egg mixture, then in flour to coat well. Brown in oil in a large frying pan. Remove with slotted spoon and set aside. Drain juice from pineapple into a 1 cup measure, add water to make 1 cup. Stir into drippings in pan. Mix brown sugar with cornstarch, vinegar and soy sauce. Stir into pineapple-juice mixture. Cook, stirring constantly, until sauce thickens and boils 3 minutes. Arrange meatballs, pineapple chunks and pepper strips in separate piles in pan. Stir each gently to coat with sauce, cover. Simmer 10 minutes or until meat balls are cooked through. Serve over rice.
ETA: I had to edit the temp for the Meatball Casserole.
I'm sure it was obvious, but I hit the zero too many times & told you to bake it at 3500 degrees.