Preheat the oven to 180 °C.
Beat the butter and brown sugar together in the bowl of an electric mixer until fluffy. Add the golden syrup and egg. Beat until combined.
Sift the flour, baking powder, bicarb and spices into the butter mixture and beat on a low speed until the mixture is combined. Cover the dough in plastic wrap and refrigerate for 30 minutes.
Roll out the dough between 2 sheets of baking paper until 4mm thick. Use different size star cutters to cut out as many stars as possible. You want at least 3 of each size. Make additional small stars to use for decorations.
Transfer the cut-out stars on to sheets lined with baking paper. Bake similar sized stars together until light golden brown. For smaller stars bake for 5-7 minutes, for larger stars bake for 8-10 minutes. Remove the cooked stars from the oven and allow to stand for 5 minutes before transferring to a wire rack to cool completely.
Mix the icing sugar and egg white together, until combined.
Start with the largest stars, use the icing to glue the next star on at an offset. Continue stacking stars on in decreasing size, stacking 2-3 stars of each size.
Finish by sticking a small star upright to the top with icing. Use additional icing to glue on cachous as decorations. Dust with icing sugar to add a snow effect.