Place oil in the bottom of the Instant Pot and turn on the sauté setting.
Add the onion and cook until lightly softened and caramelized, about 5 minutes.
Add the carrots, celery, zucchini and seasoning.
Cook and additional 3-4 minutes, stirring often.
Press cancel/keep warm button, then add all remaining ingredients except the white beans to the pot.
Place the cover on and then hit the manual button and cook on high pressure for 7 minutes.
Let the pressure come down naturally for 10 minutes, then quick release and remove cover.
Stir in the beans and season to taste.
Garnish with parsley and parmesan cheese, if using. Serve immediately.