Heat the olive oil in a large pot over medium heat. Add the onion, carrots, and celery and cook until the vegetables begin to soften.
Stir in the garlic and cook for one minute until fragrant.
Place the chicken breasts in the pot and pour in the chicken broth. Add the dried thyme and bring the mixture to a boil.
Reduce the heat to low and simmer until the chicken is fully cooked, about 15 minutes. Remove the chicken from the pot and shred it with two forks.
Return the shredded chicken to the pot. Add the egg noodles and cook until they are tender.
Season with salt and pepper. Ladle the soup into bowls and sprinkle with fresh parsley before serving.