Italian Vegetable Kebobs

1 medium zucchini, sliced
1 medium yellow squash, sliced
1 small red onion, cut into wedges
1 medium red or green bell pepper, cut into 1-inch pieces
¼ c fresh whole mushrooms
½ c Italian dressing, divided
¼ c parmesan cheese, grated
8 wooden or metal skewers
Chicken or beef (optional)

Alternately thread vegetables onto skewers. Baste with ½ of the dressing. Grill over medium heat 10 minutes or until vegetables are crisp-tender and meat is cooked (if using), turning occasionally. Remove kebobs from grill brush with remaining dressing and grate cheese over the top.