Baked Spaghetti

Ingredients

• 1 c. chopped onion
• 1 c. chopped green pepper
• 1 Tbsp. butter
• 1 (28 oz.) can tomatoes with liquid
• 1 (4 oz.) jar mushroom stems and pieces
• 1 (2 1/4 oz.) jar sliced, ripe olives, drained
• 2 tsp. oregano
• 1 lb. ground beef, browned and drained
• 12 oz. spaghetti, cooked and drained
• 1 (10 3/4 oz.) can cream of mushroom soup (undiluted)
• 1/4 c. water
• 1/4 c. Parmesan cheese