In a bowl is broken soft butter with sugar. Add vanilla and one by one - the eggs. The chocolate is melted and is poured to the mixture. Finally put starch and flour with baking powder. The mixture was stirred well. Pour into small silicon molds, spread with butter. Bake in preheated oven to 200C degrees - 20 minutes. After removing forms from the oven, leave to cool. Remove cupcakes and sprinkle with powdered sugar.