Cheeseburger Soup...but for my husbands sake renamed cheesy potato turkey soup

1 lb of ground turkey
3/4 cup chopped onion
3/4 cup carrots sliced thin
3/4 cup celery
1 tsp dried basil
1 tsp dried parsley
4 tbs butter divided
3 cups chicken broth
4 potatoes peeled and chopped
1/4 cup flour
2 cups shredded cheddar
1.5 cups milk
3/4 tsp salt
1/2 tsp pepper
1/4 cup sour cream

INSTRUCTIONS

1. Brown the ground turkey in 3 quart saucepan. Drain and set aside.
2. In the same saucepan add 1 T butter and add onion, shredded carrots, parsley flakes, basil and celery. Saute until tender.
3. Add the broth, potatoes and turkey and bring to a boil. Reduce heat, cover and simmer 10-12 minutes or until potatoes are tender.
4. In small skillet melt remaining butter (3 T) and add the flour. Cook and stir for 3-5 minutes or until bubbly. Add to the soup and bring to a boil. Cook and stir for 2 minutes. Reduce heat to low.
5. Stir in the cheese, milk, salt and pepper. Cook and stir until cheese melts. Remove from heat and blend in sour cream.