Place Washed Chicken Breasts In Large Sealable Bag. Add 1 Cup Fat-Free Italian Dressing And Close. Let Marinate For 5 To 10 Minutes. Cut Up Peppers Into Big Chunks, And Zucchini Into Big Slices. Put Into Another Sealable Bag. Coat With Leftover Dressing. Grill Chicken And Veggies Over Medium Heat.