Minestrone with Turkey Sausage Meatballs

Name: Minestrone with Turkey Sausage Meatballs
Ingredients: 0.5 lb. turkey sausage, casings removed; 1 large egg; 0.5 c. freshly chopped parsley, divided; 0.5 c. freshly grated Parmesan, divided, plus more for serving; 0.25 c. panko bread crumbs; 2 tsp. extra-virgin olive oil; 1 large onion, chopped; 3 Carrots, peeled and chopped; 3 celery stalks, chopped; 4 cloves garlic, minced; 1 15-oz. can cannellini beans, drained and rinsed; 4 c. low-sodium chicken broth; 1 28-oz. can crushed tomatoes; 1 c. short-cut pasta (such as penne, ziti, or shells); 2 c. fresh spinach