Oven Spaghetti

Ingredients

• 1 c. chopped green pepper
• 1 1/4 c. chopped onion
• 1 Tbsp. margarine or butter
• 1 (28 oz.) can tomatoes with liquid, cut up
• 1 can mushroom stems and pieces, drained
• 2 c. shredded Cheddar cheese
• 1 can cream of mushroom soup
• 1 small can ripe olives, sliced and drained
• 1 1/2 tsp. oregano
• 1 lb. ground beef or turkey, browned and drained
• 12 oz. spaghetti, cooked and drained
• 1/4 c. water
• 1/4 c. Parmesan cheese