Preheat oven to 350 °F.
Stir together all ingredients, adding water one tablespoon at a time, until the dough comes together into a ball.
Place the dough ball on the Silpat, and cover it with a sheet of parchment paper. Roll the dough out between the Silpat and baking paper to a thickness of about ⅙-inch. Carefully peel off the top layer of baking paper and use a plastic knife to cut the cookies into 2-inch squares. Leave the dough in place and lift the Silpat with the cookies onto the baking pan. Do not move the cookies.
Bake for approximately 9 minutes, until the cookies are lightly browned. Remove from the oven and cool for ten minutes before breaking them on the score lines. Serve immediately or freeze for later consumption.