Mix flour and baking powder. Cream butter, sugar and vanilla sugar with the whisk of the hand mixer. Stir in eggs, milk and sour cream one after the other. Stir in flour mixture
Put the dough into a greased, flour-blasted box form (25 cm long; 1.5 litres capacity) and smooth it down. Bake in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for approx. 45 minutes. If necessary, cover with foil approx. 10 minutes before the end of the baking time
Take the cake out of the tin, let it cool down in the tin for about 30 minutes, then carefully tap it out of the tin at an angle and let it cool down on a cake rack. Dust with icing sugar
Picture 01: Whipped sour cream with jam
Picture 03: Whipped sour cream
waiting time approx. 4 hours