1 T Oil
Heat oil in skillet. Add potatoes, salt and pepper; cook over medium heat until lightly browned, stirring occasionally. Combine flour, mustard and milk in small bowl, mix with fork until well blended. Stir milk mixture and ham into potatoes; cook until mixture thickens, stirring occasionally. Reduce heat; simmer for 5 minutes longer or until potatoes are tender. add onions and cheese before serving.