Mix the flour and baking powder together and place in a large bowl. Add sugar and sifted cocoa. Mix in the butter and eggs and knead everything well. Set aside about 1/4 of the dough and pour the other dough into a springform pan. Line the edge well.

For the filling, stir the butter until fluffy, then add the quark, sweet cream, eggs and the remaining ingredients and mix well. Then fill it into the springform pan. Finally, tear the reserved dough into pieces and spread it over the filling.
Bake the cake at 180 degrees for about an hour