Preheat oven to 350F. Lightly grease a baking sheet
In a large bowl, add cake mix, oil, milk, vanilla and cinnamon. Stir to combine until a dough forms.
Place a sheet of parchment paper on a flat surface and put the dough on it. Top the dough with another sheet of parchment paper. Using a rolling pin, roll the dough out until it is 1/4-inch thick. Remove the top layer of parchment paper.
Cut the dough into squares and poke holes, if desired. Transfer the crackers to the prepared baking sheet. You may need to bake them in two batches.
Bake for 13-15 minutes, until they are crispy. Let them cool for 10 minutes on the pan.