In a bowl, beat the butter and sugar with an electric mixer or with a fork. Add the egg and mix until combined.
Dust a flat surface with flour and roll the dough until it is around 5 mm thick.
Cut the biscuits using a cutter, or use a knife to make rectangles if you don’t have one. Just make sure to keep the sizes the same so they bake evenly.
Arrange them on a lined baking tray, making sure they don’t touch each other and baking in the oven for 15 minutes, or until the edges are golden brown.
If you want you can swap the cardamom and orange version for lime or lemon zest, it tastes delicious too. Enjoy!