Preheat oven to 350 degrees Fahrenheit. Line a baking sheet with parchment paper. In a small bowl, combine ground flaxseed and the 3 tablespoons of water. Set aside for 3-5 minutes.
In a medium bowl, combine organic cane sugar and maple syrup, followed by pumpkin puree. Whisk to combine. Then add the flax egg, followed by vanilla extract. Whisk to combine.
Add almond flour, tapioca starch, cream of tartar, baking soda, salt, and pumpkin pie spice. Stir until all ingredients are incorporated and dough has formed. Dough will be sticky.
Place the ¼ cup organic cane sugar and 2 teaspoons cinnamon for the coating on a plate or low bowl. Use a fork to combine. The dough will be sticky, so lightly dampen your hands with water, and use a tablespoon to scoop out dough. Roll dough in-between your hands into a ball. Place on plate with cinnamon sugar, roll to coat, then place on prepared baking sheet.
Press dough balls halfway down to slightly flatten with the palm of your hand. Bake for 10-12 minutes, or until cookies are set on the outside. Allow cookies to cool on baking sheet for 2-3 minutes then transfer to a wire rack to cool.