Stir together the dry ingredients in a mixing bowl. Combine the hazelnut flour, almond flour, Lakanto Golden, spices, and bicarbonate of soda.
Add the soft butter to the dry mixture. Use an electric whisk to blend until the mixture resembles a crumb texture.
In another bowl, beat the egg white until it forms stiff peaks. Gently fold the egg white into the dough until just combined.
Divide the dough into two equal parts and roll each between two sheets of greaseproof paper. Chill in the freezer for about 15 minutes.
While the dough is chilling, preheat your oven to 350F / 180C / 160C fan.
Once chilled, remove the top sheet of greaseproof paper. Use a gingerbread man cutter to cut out shapes from the dough.
If you have remaining dough, re-roll it and repeat the process until all the dough is used up.
Bake the cookies for 10 to 12 minutes, or until the edges turn golden. Allow to cool on the tray before lifting them off.
To make the icing, mix the sweetener with a little water or cream in a small bowl. Decorate the cooled cookies and allow the icing to set for about 30 minutes.