In a bowl sift flour, sugar and custard powder.

In a mixing bowl soften the butter.

Add the sifted flour mixture to the butter and mix well to form a soft dough (add milk if needed)

Make little balls with your hands or use a tablespoon and place on a baking tray lined with parchment paper.

Bake in a pre-heated oven at 180°C for 15 mins.

Let it cool before removing from tray.