Beat the eggs and sugar until fluffy. Melt the butter/margarine and stir into the egg mixture. Break the chocolate into pieces and melt it over a water bath or in a microwave at a low power. Stir the chocolate into the batter. Combine the flour, vanilla sugar and baking powder. Chop the walnuts and stir them into the batter along with the flour mixture. Pour the mixture into cake cases and bake in the centre of the oven for about 12 minutes at 200 °C.
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