Preheat your oven to 175°C (350°F). Line a baking sheet with parchment paper.
In a mixing bowl, cream together the softened butter and granulated sugar until light and fluffy.
Beat in the egg and lemon zest, mixing until well combined.
In a separate bowl, whisk together the flour, baking powder, ground cinnamon, and nutmeg.
Gradually add the dry ingredients to the creamed mixture, stirring until a dough forms. If desired, fold in the currants or raisins.
Lightly flour your work surface and roll out the dough to about 5 mm thick.
Use cookie cutters to cut out shapes and place them onto the prepared baking sheet.
Bake in the preheated oven for 10-12 minutes or until the edges are lightly golden.
Remove from the oven and let the biscuits cool on the baking sheet for a few minutes before transferring them to a cooling rack.
Once completely cooled, decorate with icing or sugar as desired.