Cheeseburger Soup

In a 3-qt. saucepan, brown beef. Add the onion, carrots and celery, saute for 5 minutes. Add the broth and potatoes; bring to a boil. Reduce heat; cover and simmer for 10-12 minutes or until potatoes are tender.
Meanwhile, in a small skillet, melt butter. Add flour; cook and stir for 3 minutes or until bubbly. Add to soup; bring to a boil. Cook and stir for 2 minutes. Reduce heat to low. Stir in the cheese, milk, salt and pepper; cook and stir until cheese melts,