This is a good soup if you want a filling meal. Its not as quick as some recipes I've seen, but it makes a nice hearty summer/fall soup, with a cheddary-type flavor.
Cut carrots into thin disks, chop celery, and slice onions thinly. In a large soup pot, combine carrots, celery, onions, 1 cup water, tamari, and spices. Saute until onions are translucent, and vegetables are soft, about 10-15 minutes. Dice potatoes into small pieces, and add to the pot, along with the rest of the water and nutritional yeast. Bring to a boil and simmer until potatoes are soft, approximately 10-12 minutes.