In a large pot, sauté onion, carrots, and celery in a little butter or oil over medium heat until softened (about 5–7 minutes).
Add garlic and cook for 1 minute.
Pour in chicken broth and add thyme, parsley, salt, and pepper. Bring to a simmer.
Simmer for 15–20 minutes, until vegetables are tender.
Add shredded chicken and noodles.
Cook until noodles are tender (6–10 minutes depending on type).
Taste and adjust seasoning as needed.