Mix all the dry ingredients then add the butter and mix with hand to form a medium-hard dough. Knead for a good 5 mins.
Do not melt the butter

Flatten the dough smooth with your hand on a tray to 1cm thickness

Gently cut into desired shape and poke with fork

Sprinkle with a tiny amount of sugar and salt for taste

Put in a 160-170°C (320-340°F) preheated oven and cook for 35-40 mins

When taken out leave to harden as it cools