Preheat oven to 350?

In a skillet saute the ground beef, onion and the green peppers for 7-10 minutes or until glossy and meat is browned. Then add the tomatoes with liquid, the mushrooms and olives and oregano. Cook the 12 ounces of spaghetti and drain. Mix together separately the mushroom soup and 1/4 cup water and the parmesan cheese.

Grease a 13x9x2 inch baking dish. Layer spaghetti, meat/veggie mix and cheese. Pour soup mixture over top. Baked uncovered for 30-40 minutes or til heated through.