Preheat oven to 160°C.

In a bowl, mix together maida, custard powder, powdered sugar, milk powder and baking powder.

Add melted butter and milk.

Mix to form smooth batter.

Pour the batter into a 5″ square tin which is greased and lined with parchment.

Bake in preheated oven for 30-40 minutes or until a tooth pick inserted comes out clean.

Let the cake cool for five minutes on the rack.

Flip it onto the wire rack, remove the parchment and flip it back so that the top of the cake remains on the top.

Allow it to cool completely.

Slice it up and serve.