Stir in potatoes and chicken broth. Bring to a boil, then simmer until potatoes are tender.
Reduce heat to low. Stir in milk, cheese, sour cream, mustard, and Worcestershire sauce until cheese melts.
Season with salt and pepper. Serve hot.
Notes
For a slow cooker version, brown beef first, then add all ingredients except cheese and sour cream. Cook on low for 6-8 hours. Stir in cheese and sour cream before serving.
Freeze without dairy ingredients for best texture.