Put all the dry ingredients into a bowl and mix. Make a well. Pour in the oil and hot water.
Using a spoon or your hands, mix everything until you have a soft dough. If it feels stiff, add a little more hot water. If it feels too moist, add a little more flour. It should feel like playdough.
Lay a piece of parchment paper on the counter. Divide the dough in half.
Roll the dough out until it is a tad thinner than for a pie crust. Use a sharp knife to cut the dough into the size crackers you want. Trim ragged edges. Do not remove from the paper.
Using a fork, prick the tops.
Place the parchment onto a baking sheet. Brush with olive oil. Sprinkle with additional coarse salt and bake 35-40 minutes. Repeat with remaining dough.
The crackers will break into squares after baked. Store in an airtight container for up to 5 days or freeze.