- 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