Preheat oven to 400F and line a baking sheet with parchment paper.
In a mixing bowl, mix the ground flax with water. Set aside to thicken.
In a separate bowl, combine the flour, baking powder, coconut sugar, salt and pumpkin spice. Mix well, then add in coconut oil and mash with a fork until it is broken up and distributed evenly. Add flax mixture and pumpkin puree. Stir well until combined.
Transfer the dough onto your parchment-lined baking sheet. Use your hands to form a round shape, about 1 inch in height. Then use a large wet knife to cut it into 6 or 8 even wedges.
Sprinkle the top with a bit of coconut sugar and cinnamon (optional) and bake for 25 minutes, or until edges are golden brown.
Remove from oven, let cool slightly and enjoy immediately.