Cheeseburger Soup

Wow this soup is good!!!!  I made it this afternoon for lunch and I ate so much I was just miserable.  Another A+ in my book!  Thanks Carri for the recommendation!!!

1/2 lb Ground Beef, browned (I used ground turkey and actually used the whole pound.  It was delish and extra meaty!)
3/4 cup chopped onion
3/4 cup shredded carrots
3/4 cup diced celery
1 tsp basil (reduce to 1/2 tsp if desired)
1 tsp parsley (reduce to 1/2 tsp if desired)
4 TBSP margarine
3 cups chicken broth
4 cups diced potatoes
1/4 cup flour
8 oz. Velveeta cheese
1 1/2 cups milk
1/2 tsp salt
1/4 tsp pepper
1/4 cup sour cream

1. In large, deep skillet, saute carrots, onions and celery in 1 TBSP marg. for 10 min.
2. Add broth, potatoes, basil, parsley and beef.
3. Bring to boil, then simmer covered for 10 min.
4. In small saucepan, cook and stir remaining margarine and the flour for 3 min.
5. Add to soup and bring to boil for 2 min. Reduce heat to low.
6. Add cheese, milk, salt and pepper. Stir until cheese melts.
7. Remove from heat and stir in sour cream.