Heat the oil in a large pot over medium heat and cook the onion, carrots and celery, stirring, until soft, about 6 minutes.
Add the broth, thyme and whole chicken breasts. Bring to a boil over high heat, then simmer gently over low heat for 18 minutes, until the chicken reaches 74°C (165°F). Lift out and shred.
Bring the soup back to a boil over medium-high heat, add the egg noodles and cook for about 7 minutes, until tender.
Return the chicken and stir in the chopped parsley, salt and pepper.
Serve hot. For leftovers, the noodles soften; store them separately if you can.
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