Grind the nuts into a flour- leave some texture if you like, but not too many chunks or the cookies won't hold.
In a large bowl, combine the ground hazelnuts, baking powder, oat flour, and arrowroot powder.
In a smaller bowl, melt the coconut oil and whisk together the liquid ingredients.
Pour wet into dry and mix until combined. Let sit for 2-3 minutes to let the arrowroot absorb.
Lay a piece of plastic wrap on the counter and place the cookie dough into the center. Wrap into a ball and place in the fridge for 30-60 minutes to firm up.
Preheat the oven to 325 degrees.
Remove the ball from the fridge and plastic wrap. Lay the dough between two sheets of parchment paper and roll until roughly ¼ inch thick. Using cookie cutters, cut the dough into shapes and use a silicone spatula to lay the cookies onto baking sheets with parchment paper.
The shapes are delicate so move slowly!
Sprinkle the cane sugar on top of the cookies and bake for 13-15 minutes (13 if you like softer cookies).
The cookies won't look done. Remove them from the oven and let sit on the baking pan for thirty minutes before removing. This gives them time to firm up.
Ice the cookies with the sugar cookie icing and enjoy!