Cheeseburger Soup

1/2 pound ground beef
3/4 cup chopped onion
3/4 cup shredded carrots
3/4 cup chopped celery
1 teaspoon dried basil
1 teaspoon dried parsley
4 tablespoons butter
3 cups chicken broth
4 cups cubed potatoes
1/4 cup all-purpose flour
2 cups cubed Cheddar cheese
1 1/2 cups milk
1/4 cup sour cream

In a large pot, melt 1 tablespoon butter or margarine over medium heat.
Cook and stir vegetables and beef , until beef is brown.
Stir in basil and parsley.
Add broth and potatoes.
Bring to a boil, then simmer until potatoes are tender, about 10-12 minutes.
Melt the remainder of butter and stir in flour.
Add the milk, stirring until smooth.
Gradually add milk mixture to the soup, stirring constantly.
Bring to a boil and reduce heat to simmer.
Stir in cheese.
When cheese is melted, add sour cream and heat through and do not boil.