Whisk together the pastry flour, all-purpose flour, sugar, salt, and baking powder in a medium-sized bowl.
In a separate bowl, whisk the egg with the oil, honey, and 2 tablespoons milk. Stir this egg mixture into the dry ingredients until you have a fairly stiff dough.You may need to add more milk, but go easy you don't want a loose dough. Wrap the dough and chill it until firm, about 1 hour.
Preheat the oven to 300°.
Divide the dough in half and, working with one piece at a time, roll the dough out about 1/16" thick between two pieces of parchment paper.
Transfer the rolled-out dough on the parchment paper to a baking sheet. Repeat.
Poke wholes evenly, to keep from puffing too much. I use a fork.
Brush both pieces of dough with milk then sprinkle with cinnamon sugar, if using.
Bake the sheets of dough for 10 minutes, rotate halfway through.
Remove pans from the oven, and use a sharp knife to cut the sheets of dough into 3" x 2" rectangles; don't separate them, just cut them. I use a magical pastry cutter.
Return the cut crackers to the oven, and continue to bake for 18 to 20 minutes.
Turn off the oven, and open the oven door wide for with the crackers inside; this helps make them extra crispy.
Remove the crackers from the oven, transfer them to a cooling rack, and cool completely.