Separate the eggs and beat the egg whites into snow. Line the springform pan with baking paper. Drain the apricots in a colander.
Mix the egg yolks, butter, quark, sugar, pudding powder and baking powder together. Fold in the egg whites and pour half of the mixture into the tin (28 cm diameter springform pan). Spread the apricots on top and pour the rest of the batter over it.