We are preparing the countertop: put melted chocolate with butter in a bain-marie. In a bowl put eggs with sugar and mix them for at least 10 minutes. Mix baking powder with flour and salt powder. Add over the composition of eggs, chocolate and butter, mixing lightly with a spatula, then add a tablespoon of flour. We mix everything easily and well. Grease the pan with butter and cover it with flour then pour the composition and put in the preheated oven at 170 degrees for 30 minutes.
We prepare cream: melt the butter and chocolate then add the sour cream and mix everything well.
Assembly: Turn the top over on a large plate and spread the jam in the empty space formed by the tray, then add the chocolate cream, which we then level with a spoon. Refrigerate for 2-3 hours.