Whisk butter, sugar and vanilla sugar with the whisk of the hand mixer until creamy. Add quark, cream and eggs and stir well. Stir milk and starch until smooth, add and stir in. Stir in almonds. Put the mixture into a well greased casserole dish (23.5 x 31 cm, 5 cm high). Smooth
Place the mould on the fat pan of the oven and fill the fat pan with hot water. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for 60-70 minutes. Then remove carefully from the oven and let it cool down on a cake rack
Select the blueberries, wash and drain well. Stir jam until smooth. Mix blueberries well into the jam. Spread evenly on the cake. Cut into pieces and arrange on plates
waiting time approx. 3 1/2 hours