Sift the flour, sugar, cocoa and the baking powder into a large bowl.Mix the butter, eggs, vanilla essence and milk together and stir this into the flour mixture. Beat until a smooth consistency is obtained.
Place paper cake cases on a baking tin and spoon in the mixture into the paper cases. Bake for 20 minutes or until each Easter cake rises. Remove from the oven and set aside to cool down. While the Easter cakes are cooling down make the icing topping.
Beat the icing sugar with the butter. Blend the cocoa powder with two tablespoons of hot water so that a paste is formed. Beat this into the butter cream. Spread this icing mixture over each Easter cake and top with a couple of mini chocolate eggs.