Nov 2, Over medium heat, whisk milk and cream cheese into soup, stirring constantly until cream cheese has fully melted, about 4 minutes. Season. Feb 20, Creamy Potato Soup - A super easy soup that is thrown in the slow I accidently put the cream cheese in at the same time as everything else. This is my favorite recipe for potato soup. Its a copycat of the one they use to serve at the St. Louis Bread Company (Panera). The recipe originally called for.