In a large bowl, mix the plain flour, xanthan gum, ground ginger, ground cinnamon and bicarbonate of soda. Add the butter and rubs between your fingers to form breadcrumbs.
Add the dark brown sugar, golden syrup and egg to form a dough. Wrap in cling film and place in the fridge for 30 minutes.
Preheat the oven to 180 degrees or gas mark 4.
Remove the dough from the fridge and roll out to a thickness of 3mm (use plain flour to prevent it from sticking to the work surface). Use a gingerbread cutter and cut out as many shapes as you can and place on a baking sheet (lined with baking paper).
Bake the cookies for 13 minutes until dark brown in colour Leave to cool on the tray for a few minutes, then transfer to a wire rack to cool.
To decorate, use a white icing pen and stick the skeleton faces (or draw your own!) then draw on the bones. Leave to set, then enjoy!