|300||Plain flour (not self-raising)|
|90||Rice flour (use ~50g if using cornflour)|
Blend butter and caster sugar until sugar is dissolved. Add flour and mix as little as necessary to clear the dough. It should look like this when you stop mixing.
Bake until done at whatever temperature is appropriate for your needs. Lower temps (150°C) give you a stronger cookie, higher temps (180°C) gives you a cookie that is softer in the middle.