Cheesy Potato and Corn Chowder

2 Tblsp butter
1 c shredded cheese
1 c chopped onion
3 c cubed potatoes
1 (4 oz) can diced green chilis
2 c milk
1 c chopped celery
2 (14.5 oz) cans chicken broth
1 can corn, drained
1 pkg country mix
In pan melt butter, add celery and onion. Cook till tender, about five minutes. Add broth, bring to boil. Add potatoes, cook on medium heat for 20-25 minutes. Stir in corn and chilis. Bring to boil. Dissolve gravy mix in milk, stir in. Add cheese. Stir till cheese is melted.