Preheat grill to medium (about 400ºF). Thread the chicken, apple, green and yellow zucchini, and onion alternately onto skewers.
Stir together basil, rice vinegar, oil, mustard, garlic, salt and pepper into small bowl. Brush the mixture over the chicken-vegetable skewers. Grill, covered, turning occasionally, until the chicken is done, 12 to 14 minutes. Remove from heat and let stand for 5 minutes.
PER SERVING: CALORIES 252; FAT 11g (sat 1.5g, mono 1.1g, poly 4.8g); PROTEIN 25g; CARB 13g; FIBER 3g; SUGARS 7g; CHOL 90mg; IRON 2 mg; SODIUM 719mg; CALC 37mg.