I made these today...
*There was No Way that I could bind it with one egg white - I ended up adding another one - this gave me a stiff paste.
*It makes more than 8X12 inch - otherwise they will be way too thick! I rolled mine thin, but would go even thinner next time - I ended up covering pretty much the whole baking tray.
*Cooking time was too short. They were fine at the edges of the sheet of cookies, but undercooked in the middle of the tray. I flipped them over onto the other piece of parchment that I had rolled over them initially, and baked on a tray for another 10 minutes - much better!
*Once cooled, they were crispy and good with roasted tomato and pepper cheese on them!
Next time, I will try them with sesame seeds. They make a nice change to the cheddar/almond crackers that I make sometimes.