To a large Dutch oven or soup pot, add a little extra virgin olive oil (or vegetable broth). When the oil begins to shimmer, add your onion, broccoli, carrots, celery, garlic, and thyme, along with sea salt and cracked black pepper. Sauté the vegetables until the onions grow translucent, about 3 minutes. Then, add your miso and stir so that all your vegetables are evenly coated. Add 1 cup of vegetable broth, together with the cannellini beans and any leftover broccoli puree, and cook until your broccoli (including the stems) is fork tender (about 7 to 8 minutes).