Preheat oven to 250 degrees, Yes 250! 350 is too hot and burns the edges.
Combine all ingredients in a bowl and let it set until all the water is absorbed.
Spread the dough between two pieces of parchment paper and roll out onto a cookie sheet until thin, 1/16th of an inch or so.
Bake for 30 minutes then remove to cut into squares. Flip them over and bake another 30 minutes until crisp. If they are still soft, bake another 10 minutes.