Grandma's Chicken Noodle Soup

I found the recipie here

Ingredients

2 1/2 cups wide egg noodles
4 cups water
1 teaspoon vegetable oil
12 cups chicken broth
1 1/2 teaspoons salt
1 teaspoon poultry seasoning
1 cup celery, chopped
1 cup onion, chopped
1/2 cup carrot, diced
1/3 cup cornstarch
1/4 cup water
4 cups diced cooked chicken
1/4 teaspoon pepper
Directions:

Directions

1
In a medium saucepan, bring about 4 cups of water to a boil. Add noodles and oil and boil 8 minutes. Drain. Rinse under cool running water. Drain again.
2
In a large saucepan or Dutch oven, bring broth, salt, pepper, and poultry seasoning to a boil. Stir in vegetables. Reduce heat, cover, and simmer 15 minutes.
3
In a small bowl, mix cornstarch and water together until cornstarch is completely dissolved. Gradually add to soup, stirring constantly. Add noodles and chicken. Heat through and serve.