Add carrots, celery, onion, oregano and slat. Stir, cooking, until softened, 10-12 minutes. Brown lightly.
Add garlic & chickpeas and stir, then pour in chicken stock. Bring to a simmer, and cook 10 minutes.
Meanwhile, trim and cut up the greens. Chop coarsely and add as much as desired to the soup. Add enough water to make sure everything is submerged. Study greens will take longer to cook than spinach. Taste and adjust salt and pepper as needed.
Garnish with a bit of shaved Parmesan or a drizzle with olive oil.