1Heat gas or charcoal grill. Spray 2 (30x18-inch) pieces of heavy-duty foil with cooking spray. For each quesadilla, place 1 tortilla on foil; spread with 2 tablespoons of the cream cheese. Top with half each of the tomatoes, chicken, mozzarella cheese, feta cheese and parsley. Top with another tortilla.
2Wrap foil securely around tortillas; pierce top of foil packet once or twice with fork to vent steam. Place foil packets, seam side up, on grill over medium heat. Cover grill; cook 10 minutes. Turn packets over. Cover grill; cook about 5 minutes longer or until cheese is melted.
3Cut each quesadilla into 8 wedges. Top with cucumber slices and olives; secure with toothpicks.