Creamy Tuscan White Bean Soup

extra-virgin olive oil

yellow onion, chopped (about 1 med. onion)

carrots, diced (about 2 med. carrots)

celery, sliced (about 3 celery ribs)

dried red pepper flakes

garlic, pressed

dried rosemary

dried thyme

bay leaves

low-sodium chicken broth

cannellini beans with liquid, 1 can reserved

to 4 cups roughly chopped kale leaves

Kosher salt and freshly ground black pepper

Shaved Parmesan cheese (optional, for serving)