Sponge
Stir butter and sugar until smooth. Add eggs, flour mixed with baking powder, and milk. Pour the batter in a large oven tray. Bake for about 15 minutes in 200º. Let Cool.

Topping
Stir butter, vanilla powder and icing sugar. Add the vanilla cream and mix well. Spread the butter-vanilla cream on the sponge cake. Great almond paste over the cake and powder with cacao.

Cake should be kept in the fridge to keep the butter cream fresh.