12 ounces packaged dried spaghetti
1 pound lean ground beef
1 cup chopped onion (1 large)
1 cup chopped green sweet pepper (1 large)
1 28 ounce can diced tomatoes, undrained
1 4 ounce can (drained weight) sliced mushrooms, drained
1 2 1/4 ounce can sliced pitted ripe olives, drained
1 1/2 teaspoons dried oregano, crushed
2 cups shredded cheddar cheese (8 ounces)
1 10 3/4 ounce can condensed cream of mushroom soup
1/4 cup water
1/4 cup grated Parmesan cheese