Baked Spaghetti

Ingredients

• 1 c. chopped onion
• 1 c. chopped green pepper
• 1 (28 oz.) can diced tomatoes with liquid
• 1 (4 oz.) can pieces and stems mushrooms, drained
• 1 (2 1/4 oz.) sliced ripe olives, drained
• 1 (10 3/4 oz.) cream of mushroom soup
• 1/4 c. grated Parmesan cheese
• 1 Tbsp. butter or margarine
• 2 tsp. dried oregano
• 1 lb. ground beef, browned and drained
• 12 oz. spaghetti, cooked and drained
• 8 oz. (2 c.) shredded Cheddar cheese
• 1/4 c. water
• 1 tsp. garlic powder