Spray 9-inch (23-cm) square baking dish with no stick cooking spray then coat with some of the icing sugar. Set aside. Microwave 1/2 cup (125 ml) of the water, granulated sugar and corn syrup in medium microwavable bowl on HIGH 7 minutes. Stir to dissolve sugar. Microwave on HIGH 5 minutes longer. (Mixture will have a slight yellow tint.) Carefully remove hot bowl from microwave.