Add broth and onions to skillet; bring to a boil. Reduce heat; simmer 5 to 10 minutes or until chicken is fork tender, its juices run clear, and vegetables are crisp-tender. Remove chicken from skillet; cover to keep warm.
In a small bowl, combine water and flour until well blended. Add to vegetable mixture; cook and stir until bubbly and thickened. Serve vegetable gravy over chicken. Makes 4 servings.