Ensure vegetables for the soup base (onion, carrots, celery) are sweated gently over medium heat until tender but not browned to build a sweet, aromatic foundation. Avoid overcooking the egg noodles; add them just before the shredded chicken and simmer only until al dente. For maximum flavor extraction when making stock, start with cold water and simmer gently, never boiling aggressively. Season the final soup just before serving, as the stock and ingredients will contribute varying levels of salinity. A squeeze of lemon juice or a dash of apple cider vinegar at the end can brighten the flavors.