Preheat barbecue or grill to medium high. Place red onion slices on a large plate. Mix olive oil and Mrs. Dash® Chicken Grilling Blend and balsamic vinegar together. Brush onion slices on both sides with seasoned mixture. Place onion and red pepper slices on barbecue and cook until grill lines appear and vegetables are tender, about 5-7 minutes on each side, basting occasionally. Place sliced cheese on a platter and top with slice of red pepper and grilled red onion.