Homemade Chicken Noodle Soup

12 cups water
2 whole chicken breasts, skinned and split
2 stalks celery with leaves, chopped
6-7 green onions (scallions) with stems and tops, chopped
1 large onion, chopped
2 medium carrots, sliced
3 cups cooked egg noodles
1 cup plain low-fat yogurt


Place all the ingredients except the noodles and yogurt in a large pot and bring to a boil. Reduce the heat, cover, and simmer for 2 to 3 hours or until the chicken is tender. Add more water if necessary. Remove the chicken from the bones and cut it into bite-size pieces. Return the chicken to the pot, along with the noodles. Simmer for 20 to 30 minutes so the noodles absorb the flavor of the chicken. Remove from the heat. Stir in the yogurt until thoroughly blended and serve.