baked spaghetti

Ingredients

• 1 cup chopped onion
• 1 cup chopped green (bell) pepper
• 1 tablespoon 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 black olives, drained
• 2 teaspoons dried oregano
• 1 pound ground beef, browned and drained, optional
• 12 ounces spaghetti, cooked and drained
• 2 cups (8-oz.) shredded cheddar cheese
• 1 can (10-3/4 oz.) cream of mushroom soup, undiluted
• 1/4 cup water
• 1/4 cup parmesan cheese