Mix salt and flour together in a large bowl.
Add water, oil, and vanilla. Mix together to form a dough. If it seems too sticky, add a little more flour. If it seems too crumbly, add a little more oil.
Add cinnamon powder and kneed it through. By adding the cinnamon at the end, you will get a light brown swirl effect through the dough. If you prefer a more uniform colour, mix the cinnamon in with the salt and flour at the beginning.