Line a cookie sheet with parchment or grease lightly. Preheat oven to 180 C or 350 F.
Beat together butter and sugar until light and fluffy.
Add vanilla and beat well.
Add the flour , cornflour and salt . Beat until a soft dough is formed.
Fill into a piping bag, snip off the end or use a tip of your choice (I used 1M tip) and pipe as desired. Or just place tablespoonfuls of dough onto the prepared baking sheet. These do not spread much , so an inch space between them is enough.
If piping ,chilling the tray at this step for 20 to 30 minutes (or freezing for 10 minutes) makes the cookies retain the design better while baking. I usually miss this step !
Bake at 180 C/350 F for 10-12 minutes. Rotate the sheet midway. The tops and edges will be browned slightly. Cool on pan for 5 minutes and then completely on a wire rack.