Chicken Sausage, Butternut Squash and Kale Soup

mild chicken Italian sausage

olive oil

medium onion, diced

stalks celery, diced

medium carrot, diced

garlic, minced

vegetable stock

chopped fresh thyme

butternut squash, cubed into 1/2-inch cubes

chopped kale

salt and pepper

parmesan cheese for garnish