Drizzle olive oil in a deep skillet over medium heat. Add chopped celery, carrots, and onion and cook for about 8 mins; stirring occasionally.
Add chopped cauliflower and mushrooms and stir. Add salt and pepper and continue to cook for roughly another 10 mins.
Finally add chicken stock, fresh and dry herbs, and stir well. Add additional salt and pepper if necessary. Cover and simmer until liquid is absorbed (about 12 - 15 mins), stirring occasionally. Serve Warm.