In Dutch oven, cook carrots, onion, celery and garlic in hot butter about 2 minutes, or until tender, stirring occasionally.
Stir broth, wild rice, thyme, salt and pepper into vegetable mixture. Bring to boil. Reduce heat. Simmer, covered, 40 minutes. Stir in chicken pieces. Return to simmer, covered, 10-15 minutes, or until rice is tender and chicken is done.
In small bowl, whisk together yogurt and flour. Gradually whisk in cream. Stir into chicken mixture. Cook and stir over medium heat until boiling. Boil 1 minute. Ladle into bowls.
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