Put all dry ingredients together in a bowl and stir together well.
In a separate bowl add the oliveoil and the water and mix this well, preferably with a mixer of some sort. Add this to the dry ingredients and knead it to a firm doughball.
Put a piece of baking paper on your kitchen top and put the dough on top. Add another sheet of baking paper on top and use a rolling pin to roll out to about 3 mm thickness.
Remove the top part, slide it onto a baking tray and with a sharp knife cut squares of about 5 m in the dough.
Bake in the preheated oven for about 15-20 minutes. Pay close attention as it can suddenly go very fast. The crackers will be done if they have brown edges