Transfer the rolled-out dough to a baking sheet; peel off the top piece and lay the bottom piece on the baking sheet. Repeat with remaining piece of dough. Sprinkle with cinnamon-sugar, if desired.
Bake crackers for 10 minutes. Remove them from the oven and use a rolling pizza wheel or sharp knife to cut the sheets of dough into 3- by 2-inch rectangles; don't separate them, just cut them. (You can use a fork to prick the crackers at this point, if you like, to add that distinctive graham cracker look.) Return the crackers to the oven, and continue to bake for 20 to 25 minutes, until they're browning around the edges.
Turn off the oven and open the oven door wide, leaving the crackers inside. After 5 minutes or so, when much of the oven's heat has dissipated, shut the oven door, and let it cool down completely with the crackers inside; this will help them become as crisp as possible.
Store the cooled crackers, tightly wrapped, at room temperature. They'll keep for several weeks.