Combine the almond flour, arrowroot, salt, coconut flour, and psyllium husks in a food processor. Give it a good whirl a few times until it's one lovely flour.
Cut the butter into small cubes. Add it to the food processor and pulse until the flour resembles coarse sand.
Add in the egg, honey, and vanilla (if using). Pulse until combined and forms a ball. Your dough should have the consistency of very soft Play-Dough.