Cheeseburger Soup

I know...it sounds gross, but it is delish! Every time I make this for any function (or my family), it is devoured and I get swamped by people asking for the recipe. :)

1 lbs ground beef/turkey
¾ cup onions, chopped
¾ cup carrots, shredded
¾ cup celery, diced
1 tsp dried basil
1 tsp dried parsley flakes
4 Tbsp butter or margarine, divided
3 cups chicken broth
4 cups potatoes, peeled and diced
¼ cup flour
8 oz Velveeta, cubed (about 2 cups)
1 ½ cups milk
¾ tsp salt
¼ – ½ tsp pepper
¼ cup sour cream

Brown beef in a 3 quart saucepan, drain, and set aside. In the same saucepan, sauté onion, carrots, celery, basil, and parsley in 1 tablespoon butter until vegetables
are tender—about 10 minutes. Add broth and potatoes and beef, then bring to a boil. Reduce heat; cover and simmer for 10-12 minutes or until potatoes and carrots 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 heat and blend in the sour cream.