Tuscan White Bean Soup

Ingredients:

2 tablespoons olive oil
1 onion, finely chopped
2 cloves garlic, minced
2 carrots, peeled and diced
2 celery stalks, diced
1 teaspoon dried thyme
1 teaspoon dried rosemary
1 can (15 ounces) cannellini beans, drained and rinsed
4 cups vegetable broth
1 bay leaf
Salt and pepper, to taste
2 cups fresh spinach or kale, chopped
Juice of 1 lemon
Grated Parmesan cheese (optional, for garnish)
Fresh parsley, chopped (for garnish)