To make quesadillas, top half of each tortilla with chicken, kimchi, cheese and green onion. Fold tortillas in half. Brush both sides of tortilla with oil. Heat 12-inch nonstick skillet over medium-low heat. Add 2 quesadillas to skillet. Cook 2 to 3 minutes, turning once, until tortilla is brown and crisp and cheese is melted. Repeat with remaining quesadillas. Cut quesadillas into wedges. Serve with sauce.