Sauté the veggies:
Heat butter + olive oil in a large pot. Add onion, carrots, and celery. Cook 5–7 minutes until soft. Add garlic and cook 1 minute.
Add flour:
Sprinkle flour over the vegetables and stir for 1 minute—it helps thicken the soup.
Add broth:
Slowly pour in chicken broth while stirring to avoid lumps.
Simmer:
Add thyme, parsley, salt, and pepper. Bring to a boil, then reduce heat and simmer for 10 minutes.
Add noodles + chicken:
Add egg noodles and shredded chicken. Cook 8–10 minutes until noodles are tender.
Finish with cream:
Add heavy cream (or milk). Stir and let simmer 2–3 more minutes—don’t boil after adding cream.
Taste + adjust:
Add more salt, pepper, or lemon juice if needed.