Preheat your oven to 180°C (350°F) and line a baking sheet with parchment paper.
In a mixing bowl, cream the softened butter and granulated sugar together until light and fluffy.
Beat in the egg, mixing until fully incorporated.
In a separate bowl, whisk together the all-purpose flour, baking powder, ground cinnamon, ground nutmeg, and lemon zest.
Gradually add the dry ingredients to the butter mixture, stirring until a dough forms. If using, fold in the currants or raisins.
Lightly flour a surface and roll out the dough to about 5mm (¼ inch) thickness.
Use cookie cutters to cut out shapes and place them on the prepared baking sheet.
Bake in the preheated oven for 10-12 minutes or until golden around the edges.
Remove from the oven and let them cool on the baking sheet for a few minutes before transferring to a cooling rack.
Once completely cooled, you can dust with icing sugar for decoration if desired.