Spinach-Stuffed Shells
["24 jumbo macaroni shells", "1 (32 oz.) jar spaghetti sauce with mushrooms", "1 (10 oz.) pkg. frozen, chopped spinach, thawed and drained", "2 c. Ricotta cheese", "2 c. shredded Mozzarella cheese", "1 small onion, diced", "1/2 c. grated Parmesan cheese", "2 Tbsp. chopped fresh parsley", "1 tsp. dried oregano", "dash of hot sauce", "1/4 c. grated Parmesan cheese"]
["Cook macaroni shells according to package directions; drain and set aside."]
["macaroni", "mushrooms", "Ricotta cheese", "Mozzarella cheese", "onion", "Parmesan cheese", "parsley", "oregano", "hot sauce", "Parmesan cheese"]