Heat the olive oil over medium heat in a large stockpot or dutch oven. Add the onion, carrots, celery, zucchini, garlic, Italian seasoning, salt, pepper, and thyme. Cook, stirring occasionally, for 6–7 minutes as the vegetables soften up and let out some juices.

Add broth, water, red wine vinegar, bay leaf, all the beans, diced tomatoes, and tomato paste. Bring to a boil, then add uncooked rice or pasta. Cover and simmer for 35 minutes. Stir in the chopped spinach and simmer for 5 more minutes. Remove bay leaf.

Serve soup warm in homemade bread bowls (or regular bowls, of course!) and top with fresh parmesan cheese, if desired.

Keep leftovers in a large covered container in the refrigerator for up to a week. To reheat, simply pour into a pot over medium heat and cook until warm. Feel free to add more broth to the leftovers as it cooks if it is too thick—I always do. (It thickens in the refrigerator as the veggies and rice/pasta soak up the liquid.)