This creamy sausage and potato soup is the perfect thing to warm you through on a cold day.
Heat butter in a medium skillet over medium heat; add the other onion. Sauté until tender, about 5 minutes. Add the flour or cornstarch, and cook for 1 minute longer. Gradually stir in the milk and evaporated milk or cream. Cook, stirring continually, until thickened (about 5 minutes). Add the salt and pepper; mix well. Stir the milk mixture into the broth with meat and potatoes.
Simmer over low heat, stirring frequently, about 10-30 minutes. Ladle soup into bowls, and top with cheddar cheese and green onions.