Place puff pastry sheets next to each other and allow to thaw. Coarsely grate the marzipan. Gradually add the egg with the whisk of the hand mixer. Stir in crème fraiche at the end. Place the dough slices on top of each other and roll out into a rectangle (approx. 20 x 34 cm) on a floured work surface.
Spread the marzipan mixture on top, leaving a margin of about 2 cm all around. First fold over the long sides, then the short sides. Place the strips on baking paper.
Whisk the egg yolk and spread on the dough strips. Wash apples, grate dry. Cut out the core with an apple cutter. Finely slice the apples. Crumble the Amarettini, sprinkle on the marzipan mixture.
Spread apples over it. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for approx. 10 minutes. Heat the jam and spread it on the apples immediately after baking.
Let it cool down.