DIRECTIONS
Place potatoes and sweet potato on an 18-in. x 15-in. piece of heavy-duty foil. Drizzle with half of the garlic, parsley, salt and lemon-pepper. Seal packet tightly. Grill, covered, over indirect medium-hot heat for 20 minutes on each side.
Meanwhile, place mushrooms, onion, green pepper, zucchini and summer squash on a 20-in. x 18-in. piece of heavy-duty foil. Drizzle with remaining butter; sprinkle with remaining seasonings. Seal packet tightly. Grill, covered, over medium-hot heat for 10 minutes on each side or until the vegetables are crisp-tender.
Combine the contents of both packets in a serving bowl; sprinkle with cheese. Serve with sour cream if desired. Yield: 8-10 servings.