In small bowl, combine soy sauce, brown sugar, ginger and garlic powder; mix well. Place chicken on plate. Brush both sides of each breast half with soy sauce mixture. Cover; let stand 15 min. at room temperature to marinate. Heat grill. When ready to barbecue, oil grill rack. Place chicken on gas grill over med. high heat or on charcoal grill 4-6 inches from med. high coals. Cook 8-10 min. or until chicken is tender and juices run clear, turning once. Top each with pineapple slice during last few minutes of cooking time. Serve sprinkled with coconut. S: Fast & Healthy. Calories: 190, Fat: 4g