Cook sausage in a dutch oven, set aside. Saute onions. Add remaining ingredients and boil. Simmer for 10 minutes.
Turn off heat. Add the milk and stir in.
Add the roasted butternut squash. Blend the soup in batches until smooth. Dish out and drizzle with a bit of milk, half and half, sour cream, or creme fraise. Serve hot.