Creamy Tortellini Soup with Sausage and Spinach

Name: Creamy Tortellini Soup with Sausage and Spinach
Ingredients: 1 teaspoon olive oil; 1 pound mild Italian sausage, removed from casings if purchased in links; 1 large yellow onion, diced; 8 ounces mushrooms, diced; 1 teaspoon salt, divided; 2 large carrots, diced; 2 cloves garlic, minced; 2 quarts chicken stock; 1 pound fresh or frozen cheese tortellini; 10 ounces baby spinach, kale, chard, or other green (torn into the size of baby spinach, if necessary); 1 15-ounce can cannellini beans; 2 teaspoons cider vinegar; 1/2 cup heavy cream or whole milk