1. For the stock: Heat oil in large Dutch oven over medium-high heat until shimmering. Add ground chicken, onion, carrot, and celery. Cook, stirring frequently, until chicken is no longer pink, 5 to 10 minutes (do not brown chicken).

2. Reduce heat to medium-low. Add water, broth, bay leaves, salt, and chicken breasts; cover and cook for 30 minutes. Remove lid, increase heat to high, and bring to boil. (If liquid is already boiling when lid is removed, remove chicken breasts immediately and continue with recipe.) Transfer chicken breasts to large plate and set aside. Continue to cook stock for 20 minutes, adjusting heat to maintain gentle boil. Strain stock through fine-mesh strainer into large pot or container, pressing on solids to extract as much liquid as possible. Allow liquid to settle about 5 minutes and skim off fat (see note).

3. For the soup: Return stock to Dutch oven set over medium-high heat. In small bowl, combine cornstarch and water until smooth slurry forms; stir into stock and bring to gentle boil. Add onion, carrots, celery, and potato and cook until potato pieces are almost tender, 10 to 15 minutes, adjusting heat as necessary to maintain gentle boil. Add egg noodles and continue to cook until all vegetables and noodles are tender, about 5 minutes longer.

4. Meanwhile, remove skin and bones from reserved cooked chicken and discard. Shred meat with fingers or 2 forks. Add shredded chicken, Swiss chard (if using), and parsley to soup and cook until heated through, about 2 minutes. Season with salt and pepper; serve.

Serves 4 to 6