Baked Spaghetti

Ingredients

• 1 cup chopped onion
• 1 cup chopped green pepper
• 1 tablespoon butter
• One 28-ounce can tomatoes, cut up with liquid
• One 4-ounce can mushroom stems and pieces, drained
• One 2 1/4 ounce can olives, sliced
• 1 teaspoon dried oregano
• 1 pound ground beef, browned and drained
• 12 ounces spaghetti, cooked and drained
• 2 cups cheddar cheese, shredded
• 1 can cream of mushroom soup
• 1/4 cup water
• 1/4 cup parmesan cheese, grated