Put butter into the mix bowl, add caster sugar. Whisk it until smooth. Add egg whisk to mix it well. Sift the cake flour and corn flour in, whisk it to mix it well. Then divide into 2 parts. Ones add vanilla and the other one add the dissolve coffee. Use the spatula to combine it.

Put the batter into the piping bags. Squeeze the batter in the baking mat on tray. Chill it for 30 minutes. Preheat the oven at 160 degrees celsius, bake at 150 degrees celsius approx 20 minutes.