Cheeseburger Soup

1/2 pound ground beef
3/4 cup chopped onion
3/4 cup shredded carrots
3/4 cup diced celery
1 teaspoon dried basil
1 teaspoon dried parsley flakes
4 tablespoons butter, divided
3 cups chicken broth
4 cups diced peeled potatoes (1-3/4 pounds)
1/4 cup all-purpose flour
2 cups (8 ounces) VELVEETA Pasteurized Prepared Cheese Product
1-1/2 cups milk
3/4 teaspoon salt
1/4 to 1/2 teaspoon pepper
1/4 cup sour cream

Directions
In a 3-qt. saucepan, brown beef; drain and set aside. In the same saucepan, saute onion, carrots, celery, basil and parsley in 1 tablespoon 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 or until potatoes are tender.
Meanwhile, in a small skillet, melt remaining butter. Add flour; cook and stir for 3-5 minutes or until bubbly. Add to soup; bring to a boil. Cook and stir for 2 minutes. Reduce heat to low. Add cheese, milk, salt and pepper; cook and stir until cheese melts. Remove from the heat; blend in sour cream. Yield: 8 servings (2-1/4 quarts).