Add dry crust ingredients, minus ¾ cup maple sugar, to bowl of electric mixer and mix until combined. Add liquid ingredients to bowl and mix until dough-like batter appears. (Note: May need to scrape down paddle and mix again. If batter is too wet and sticky, add more cassava and arrowroot, 1-2 tbsp at a time. If dough is too dry, add more water, 1 tbsp at a time.)