Tried this recipe and it turned out quite nice. The recipe was given in KC original but now the recipe has been changed slightly. This is a very easy recipe to try. (As I do not have the madeleine moulds yet, I have used mini tart moulds for the baking.)
200 gm cake flour
1 tsp baking powder
160 gm castor sugar
1 orange zest
3 tsp of orange liquer (optional)
200 gm melted butter
Beat eggs with sugar until fluffy and white. Add in sifted flour and baking powder. Mix well. Than add in orange zest and liquer and melted butter. Mix well and spoon into well greased moulds.
Preheat oven to 180C and baked for about 15 mins until brown and cooked. Unmould and cool it on wire rack.