Sauté the veggies. Heat olive oil in a large pot over medium heat. Add onion, carrots, and celery with a pinch of salt. Cook 6 to 8 minutes until softened.
Add garlic. Stir in garlic and cook 30 seconds, just until fragrant.
Simmer the chicken. Add broth, salt, pepper, thyme, and bay leaf. Add chicken. Bring to a gentle simmer, then reduce heat to low and cook 12 to 15 minutes, until chicken is cooked through.
Shred. Remove chicken to a plate and shred or chop. Return it to the pot.
Cook the noodles. Bring soup back to a simmer. Add egg noodles and cook 6 to 8 minutes (or according to package) until tender.
Finish. Turn off heat. Stir in herbs and lemon juice if using. Taste and adjust salt and pepper.
Serve. Serve hot, with extra herbs on top if you want.