Grease a springform pan (26 cm Ø; approx. 8 cm high) and sprinkle with breadcrumbs. Drain the apricots well. Beat eggs, sugar and salt for about 5 minutes until fluffy. Mix quark, mascarpone and vanillin sugar. Stir into the egg mixture. Stir in pudding powder. Spread the cheese mixture into the mould.
Place the apricots on top. Bake in the preheated oven (electric range: 175 °C/ convection oven: 150 °C/ gas: level 2) for 1-1 1/4 hours. Let the cake cool down in the tin for about 8 hours. Heat the jam and pass through a sieve. Spread apricots with it. Dust the cheesecake with icing sugar