Mix all ingredients well in a small bowl; everything should be moist and the dough should hold together somewhat.
Put the dough on a well-greased sheet of parchment paper or heavy-duty aluminum foil, about 15x18" (it's helpful to crumble the dough mixture and spread the crumbs in a roughly rectangular shape on the foil).
Cover the dough with a piece of wax paper that's been sprayed with non-stick spray.
Roll out the dough to about 1/8" thick or slightly thinner; try to get the dough to an even thickness; you can also carefully peel up the wax paper and reshape the dough to get it as close to rectangular as possible, about 9x9" square.
Replace the wax paper and continue rolling until nice and even.
Peel off the wax paper and use a pizza or ravioli cutter to score the dough into approximately 48 1-inch squares.
Lift the foil and set it on the oven rack and bake them at 325º for 10-15 minutes, or until golden brown.
Check after 10 minutes and if crackers at outer edge are getting pretty brown, remove those and continue baking the rest until golden; use a thin metal spatula to very gently pry the crackers from the foil.
Break them apart on the score lines and let cool.