For the spelt moons, mix birch sugar, vanilla powder, salt, butter and egg in a baking bowl until creamy.
Add spelt flour and knead into a dough. Wrap in plastic wrap and let rest in refrigerator for about 1 hr.
Roll out the dough on a floured surface to about 5 mm thick and cut out moons. Place on a baking tray lined with baking paper and bake for about 10 minutes at 170 degrees.
After cooling, dip half of the spelt moons in chocolate icing and let dry on a cake rack.