Cheeseburger Soup

1/2 lb ground beef, browned
3/4 C chopped onion
3/4 C chopped celery
1 tsp dried basil
1 tsp dried parsley
4 T butter
3 C chicken broth
4 C diced potatoes
1/4 C flour
1 1/2 C milk
3/4 tsp salt
1/4 tsp pepper
8 oz cubed cheddar cheese
1/4 C sour cream

Cook the onion, celery, basil, parsley, butter, chicken broth and potatoes until tender. Mix together the flour and milk until well combined and add to soup. Season with salt and pepper. Add cheese, ground beef and sour cream just before serving. Stir until cheese has melted.