Chicken Tortellini Soup

A good friend, Melena, made this for a "Souper Saturday" and I knew I HAD to have the recipe. This is soooo yummy!!

3 cups chicken broth
3 cups cooked chicken, cut up
1 med. onion, chopped
1 stalk celery, thinly sliced
1/2 tsp. basil
3 Tbsp. flour
3/4 cup half and half
1/4 cup shredded carrots
1 pkg. prepared tortellini

Heat broth, onion, celery and basil in saucepan until boiling. Reduce heat to low and cover and simmer for 15 min. Stir flour into half and half until smooth. Stir into soup. Heat to boil stirring constantly, boil and stir for 1 min. Stir in chicken, carrots and tortellini. Cook until tortellini is tender.