Preheat oven to 350, (or 375 if your oven runs cold).
Combine dry ingredients in a large bowl (not flaky salt).
Combine oil and maple syrup with 3/4 cup room temp water. Pour over dry ingredients and stir to combine. Mixture will look wet. Let sit 10 minutes.
Form into a loose ball and place on parchment paper lined baking sheet. Top with another piece of parchment paper and roll out with rolling pin until 1/8 inch thick. It doesn't matter the shape, but thickness should be uniform so that edges don't burn.
Remove top sheet of parchment, and cut cracker dough into 4 parts just using a spatula or dull knife (will make it easier to turn). Sprinkle with flaky salt, and bake for 15 minutes on the middle rack.
Remove from oven, turn over and bake another 15-20 minutes. Cracker should be golden brown by this point and crispy, but if it isn't then turn your oven down to 250 and let it crisp up another 10 minutes or so.
Remove and let cool on baking sheet. Break into desired size pieces, and store in airtight container in fridge for a few days.