I tried this recipe posted at drNo's blog...moist and lovely...strongly recommended...!
1 cup butter
1 cup sugar
1 tsp vanilla essence
1 cup all purpose flour
1 cup custard powder
1 tsp baking powder
1 tsp soda bicarbonate
-beat butter and sugar until fluffy
-beat in eggs one by one.
-add dry ingredients that have been sifted together
-mix in vanilla essence
-scoop into prepared muffin tin
-bake 20-25minutes in a preheated oven 175 degrees C.