Cut chicken into cubes. Heat oil in dutch oven, adding chicken and ham. Saute meats, stirring to keep from sticking, for about 5 minutes. Add frozen potatoes, soup and soymilk. Cook over low heat for 8 minutes, until potatoes are soft. Add swiss cheese and mustard, stirring gently to combine all ingredients. Heat until cheese is melted; stir to blend well. Serve immediately.