3/4 c chopped celery

3/4 c chopped onion

1/4 c butter or margarine

2 cans (14 1/2 ounces each) chicken broth

2 1/3 c mashed potato flakes

1 1/2 c milk

1/2 c cubed process American cheese

3/4 t. garlic salt

1/8 to 1/4 t. chili powder

1/2 c sour cream