In large saucepan, melt margarine over medium high heat. Add celery and onion; cook and stir until tender, about 5 minutes.
Add chicken broth; bring to a boil. Add potatoes; cook over low heat for 20 to 25 minutes or until potatoes are soft, stirring occasionally.
Stir in corn and chiles; return to boiling. Dissolve gravy mix in milk; stir into boiling mixture. Add cheese; cook and stir over low heat until cheese is melted.
