Mix together the 1 tbsp flax with water in a small ramekin and sit in the fridge for 15 minutes to set as a flax egg.
In a medium bowl, mix the peanut butter, butter, maple, and sugar. Beat using electric beaters until fluffy and combined.
Add the flax egg and vanilla and beat until combined.
In another large bowl, mix together the almond flour, flax, baking soda, baking powder, cinnamon and salt. Add the wet to the dry ingredients.
Refrigerate the batter for 1 hour.
Preheat to 350 F and line two baking sheets with parchment paper.
Roll a heaping tablespoon into balls and flatten until they're about 2 inches in diameter.
Lightly press your fork into them to make a cross hatch and sprinkle with hemp hearts. Make sure there is at least an inch between the cookies.
Bake for 12-14 minutes or until lightly browned on the bottom. These are very delicate cookies so allow them to cool completely before transferring them to an air-tight container.