Grease cups well and place them on a baking tray. For the dough, whisk butter, sugar and vanilla sugar until creamy. Stir in the eggs one after the other. Stir in 100 g nut nougat cream.
Mix flour, baking powder and cocoa. Alternately stir 200 g cream into the egg-fat cream. Pour the dough into a piping bag and fill the cups to about 3/4 with it. Bake in a preheated oven (electric cooker: 175 °C/ circulating air: 150 °C/ gas: see
manufacturer) Bake for 30-35 minutes. Take out and let cool down.
Warm 100 g nut nougat cream over a warm water bath and stir until smooth. Whip 250 g cream until stiff. Spread over the cake. Spill Nutella on it and pull it through with a wooden skewer.