| 1 | C | Chopped onion |
| 1 | C | Chopped green pepper |
| 1 | tbsp | Butter or margarine |
| 1 | can (28 oz) | Tomatoes with liquid, cut up |
| 1 | can (4 oz) | Mushroom stems and pieces, drained |
| 1 | can (2-1/4 oz) | Sliced ripe olives, drained |
| 2 | tsp | Dried oregano |
| 1 | lb | Ground beef, browned and drained, optional |
| 12 | oz | Spaghetti, cooked and drained |
| 2 | C (8 oz) | Shredded cheddar cheese |
| 1 | can (10-3/4 oz) | Condensed cream of mushroom soup, undiluted |
| 1/4 | C | Water |
| 1/4 | C | Grated parmesan cheese |