Cheeseburger Soup

1/2 pound ground beef
3/4 cup chopped onion
3/4 cup shredded carrots
3/4 cup diced celery
1 tsp dried basil
1 tsp dried parsley flakes
4 Tablespoons butter or margarine, divided
3 cups chicken broth
4 cups diced, peeled potatoes
1/4 cup flour
8 ounces american, processed cheese (2 cups)
1 to 1-1/2 cups of milk
3/4 tsp salt
1/4 tsp pepper
1/4 cup sour cream

In a 3 quart saucepan, brown beef, drain, and then set aside the beef.  In the same pan, sautee onions, carrots, celery, basil, parsley, 1 Tablespoon of butter, until vegetables are tender.  About 10 minutes.  Add broth, potatoes, and beef, bring to a boil.  Reduce heat, cover and simmer for 10-12 minutes, until potatoes are tender.  Meanwhile, in a small skillet, melt remaining butter, and add flour.  Cook and stir for 3-5 minutes until bubbly, then add to your soup.  Cook and stir for 2 minutes.  Reduce heat to low, then add your cheese, milk, salt and pepper.  Cook and stir until cheese melts.  Remove from heat, blend in your sour cream.