Beat the softened butter with the sugar and vanilla sugar until frothy. Stir in the sour cream and continue beating for about 2 minutes (longer than too little).
Then stir in the flour with the baking powder until a fluffy dough is formed. Put the dough in a Gugelhup pan (or loaf pan) and bake at 180 ° C for about 25 minutes. May take longer, depending on the oven.
After cooling, sprinkle with couverture or powdered sugar.
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