Place the puff pastry slices next to each other and let them thaw for about 5 minutes. Cut the slices into three and place each one on a baking tray lined with baking paper with a distance of approx. 2 cm between them. Whisk the egg yolks with 2 tbsp. water. Brush the dough pieces with it and sprinkle with sugar crystals. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for 10-12 minutes until golden brown. Let them cool down on a cake rack
In the meantime, whip the cream, crème fraîche and vanilla sugar in a tall container using the whisks of the hand mixer. Wash peaches, grate dry, halve and remove stones. Cut each half into 4 slices. Heat the jam in a pot while stirring
Biscuits crumble. Cut puff pastry rectangles in half horizontally. Cover the underside with peach wedges. Drizzle jam over them. Add biscuit crumbs and crème fraîche cream. Finish with upper puff pastry halves