1.Cook Pasta According To Package Directions. Meanwhile, In A Nonstick Skillet, Saute Onion, Celery And Garlic In Oil Until Tender. Drain Pasta; Place In A Bowl, Add The Onion Mixture, Chicken, Soup, Milk, Frozen Vegetables, Cheese, Parsley, Thyme And Salt. 2.Pour Into A Shallow 3-Qt. Baking Dish Coated With Nonstick Cooking Spray. Cover And Bake At 350