Heat oil over medium heat in large saucepan. Add onion and carrot and sauté until onion is soft. Add celery and cook for a further 2 minutes. Add salt, Italian seasoning and black pepper.

Add chicken stock pot and 1L water. Turn up heat to high, cover until it reaches boil. If one chicken breast is bigger than the other, slice it down so they’re more even in size. Add chicken to the saucepan. Turn heat down to medium, cover and let simmer until chicken is cooked through, about minutes depending on size of chicken.