These are delicious crackers and so full of goodness, just go to a bulk bin supplier and measure out what you want then go home and bake. The tricky thing is getting them thin enough (as thin as you can manage) as they taste best nicely browned. Cooking times will vary according to the power of your oven – check after about 18 minutes, but they may take 35-40 minutes to get nicely browned; rotate the trays during cooking if necessary to get an even colour. Delicious with a slice of gruyere and a little gherkin.