Notes: This recipe may be halved or make 2 casseroles and freeze one (uncooked).
| 1 1/2 | pounds | Italian sausage links |
| 1/2 | pound | mushrooms, sliced |
| 1 | cup | onions, chopped |
| 32 | ounce jar | spaghetti sauce |
| 1 | pound | mozzarella cheese, sliced or grated |
| 1 | pound | ziti or other long tube pasta |