Preheat the oven to 150 °C (convection).
Put all the ingredients together in a bowl and mix with a spoon to form a homogeneous mixture. Spread half of the mixture onto each of two baking trays lined with baking paper and spread evenly, as thinly as possible, using a pastry card or spoon.
Place both trays together in the preheated oven and bake for approx. 15 minutes.
Remove the trays from the oven and divide the mixture into small rectangles using the pastry card or a knife. Then put the trays back in the oven and bake for a further 35 minutes.
Then sprinkle the grated cheese over the crackers and bake for a further 20 minutes.
