Spinach Stuffed Shells
["1 qt. spaghetti sauce", "1 (12 oz.) pkg. jumbo macaroni shells", "2 (9 or 10 oz.) pkg. frozen, chopped spinach", "1 can cream of mushroom soup", "1 c. milk", "1 (16 oz.) container cottage cheese", "1 (8 oz.) pkg. Mozzarella cheese, shredded"]
["Heat spaghetti sauce to boiling. Reduce heat to low.", "Cover and simmer 20 minutes to blend flavors."]
["spaghetti sauce", "jumbo macaroni", "frozen", "cream of mushroom soup", "milk", "cottage cheese", "Mozzarella cheese"]