In a Dutch oven, heat butter over medium-high heat. Add carrots, celery and onion; cook and stir until tender., Stir in flour until blended; cook until bubbly. Gradually stir in broth. Bring to a boil, stirring constantly; cook and stir 1-2 minutes or until thickened., Stir in remaining ingredients; return to a boil. Reduce heat; simmer, uncovered, 20 minutes, stirring occasionally.