Put softened butter, icing and vanilla. Use the spatula to fold them until light in color. Add egg yolk, whisk it. Then in another bowl mix all purpose flour and corn starch, whisk to mix them. Put the mix flour into the butter bowl, whisk it. Add cornflakes and dried longan, whisk to combine well. Scoop it on the baking tray.

Bake at 160 degree celsius for 15-20 minutes. Ready to enjoy.