Slow Cooker Minestrone Soup

Ingredients

• 2 teaspoons olive oil
• 1/2 cup onion, chopped
• 1 cup carrots, diced
• 1/2 cup celery, diced
• 2 garlic cloves, minced
• 1 (15-ounce) can white beans, drained and rinsed
• 1 (32-ounce) carton reduced-sodium chicken broth
• 1 (28-ounce) can diced petite tomatoes
• 1 parmesan cheese rind, optional
• 1/2 teaspoon kosher salt, plus more, to taste
• 1/2 teaspoon fresh black pepper, plus more, to taste
• 1 fresh rosemary sprig
• 2 bay leaves
• 2 tablespoons fresh basil, chopped
• 1/4 cup fresh Italian parsley, chopped
• 1 medium zucchini, diced
• 2 cups frozen spinach, defrosted and chopped
• 2 cups small pasta such as ditalini, cooked
• parmesan cheese, optional, to taste, grated, for garnish