White Bean Sausage Soup

Name: White Bean Sausage Soup
Prep time: 20 min
Cook time: 40 min
Total time: 1 h
Cuisine: American
Ingredients: 2 tablespoons vegetable oil; 9 ounces ground sausage; 1 large onion, chopped; 2 large carrots, peeled and chopped; 3 celery stalks, chopped; Kosher salt; Black pepper; 1 (15-ounce) can white beans; Rosemary sprig; 4 cups chicken stock; Parmesan rind; 4 cups baby spinach, roughly chopped; 1 teaspoon chili flakes