Meatball Sub Casserole - only 6 ingredients and ready in 30 minutes! french bread, cream cheese, Italian seasoning, frozen meatballs, spaghetti sauce and mozzarella cheese. French bread topped with a yummy seasoned cream cheese, topped with meatballs, spaghetti sauce and mozzarella cheese. Everyone LOVES this casserole - especially the kids!! It is SOOO good! A fun twist to pizza night!