Slow Cooker Vegetarian Minestrone

6 cups vegetable broth

1 (28 ounce) can crushed tomatoes

1 (15 ounce) can kidney beans, drained

1 large onion, chopped

2 ribs celery, diced

2 large carrots, diced

1 cup green beans

1 small zucchini

3 cloves garlic, minced

1 tablespoon minced fresh parsley

1 1/2 teaspoons dried oregano

1 teaspoon salt

3/4 teaspoon dried thyme

1/4 teaspoon freshly ground black pepper

1/2 cup elbow macaroni

4 cups chopped fresh spinach

1/4 cup finely grated Parmesan cheese, or more to taste

What You Need