Grease a springform pan (26 cm Ø) and sprinkle with breadcrumbs. Preheat oven (electric cooker: 175°C/circulating air: 150°C/gas: level 2). For the sponge mixture mix 125 g butter, 125 g sugar, 1 vanilla sugar and 1 pinch of salt until creamy.
Stir in the eggs one by one. Mix flour and baking powder, sieve over it and stir in briefly, alternating with the milk. Spread into the tin and bake in a hot oven for about 20 minutes. Remove the cake from the edge of the tin and let it cool down in the tin.
Drain the apricots and dice finely. Mix quark, 75 g sugar and 1 vanilla sugar. Whip the cream until stiff, while pouring in the cream firming agent. Fold the cream into the quark. Remove a good 1/3 of the quark cream.
Fold the apricots into the rest of the cream.
Remove the cake from the tin and place it on a cake plate. Place a cake ring around it. Spread a thin layer of the pure quark cream on the base. Place about 18 chocolate kisses on the cake as a border (eat the rest).
Smooth the apricot quark in the middle and spread with the rest of the pure quark cream. Chill the cake for at least 4 hours. Decorate with gummy bears and candles just before serving.