Heat the extra virgin olive oil in a large pot over medium heat.
Add the diced onion, sliced carrots, and sliced celery to the pot and sauté for 5-7 minutes until the vegetables begin to soften.
Stir in the minced garlic and dried oregano, cooking for another minute until fragrant.
Pour in the chicken broth and add the whole chicken breast to the liquid.
Bring the soup to a gentle simmer, cover, and cook for 15-20 minutes or until the chicken is fully cooked through.
Remove the chicken breast from the pot, shred it into bite-sized pieces using two forks, and return the meat to the soup.
Add the rinsed cannellini beans and chopped kale to the pot, simmering for 3-5 minutes until the kale is wilted and the beans are heated through.
Season with sea salt and black pepper before serving hot.