Heat the olive oil in a large pot over medium heat.
Add the diced onion, carrots, and celery, sautéing for 5-7 minutes until the vegetables begin to soften.
Stir in the minced garlic and dried oregano, cooking for 1 minute until fragrant.
Place the whole chicken breast into the pot and pour in the chicken bone broth and water.
Bring the liquid to a gentle boil, then reduce heat to low, cover, and simmer for 15-20 minutes until the chicken is cooked through.
Remove the chicken breast from the pot, shred it with two forks, and return the shredded meat to the soup.
Add the rinsed chickpeas and fresh spinach to the pot, stirring until the spinach is wilted and the chickpeas are heated through.
Season with sea salt and black pepper before serving hot.