Heat oil in large pot over medium heat
Sauté onion, garlic, carrots, celery (5-7 min)
Add mushrooms, cook until softened
Add potatoes, beans, broth, thyme, bay leaves
Bring to boil, reduce heat, simmer 15 min
Add spinach in batches until wilted
Stir in cream
Season with salt and pepper
Add Parmesan if using