Sauté Vegetables: Heat oil/butter in a large pot over medium heat. Add onion, carrots, and celery. Cook for 5 minutes until softened.
Add Aromatics: Stir in garlic, salt, pepper, thyme, and bay leaf. Cook for 1 minute until fragrant.
Simmer Broth: Pour in chicken broth and bring to a boil. Reduce heat and simmer for 10 minutes.
Add Chicken & Noodles: Stir in shredded chicken and egg noodles. Cook for 8–10 minutes until noodles are tender.
Finish: Remove bay leaf. Stir in parsley and lemon juice (if using). Adjust seasoning to taste.
Serve: Ladle into bowls and enjoy warm!