Let the puff pastry slices thaw at room temperature for about 15 minutes. In the meantime drain the peaches and cut them into slices. Cut marzipan into small cubes. Roast the flaked almonds in a pan without fat. Cut each slice of puff pastry into four equally sized strips. Place the strips on a baking tray lined with baking paper and bake in a preheated oven (electric range: 200 °C/ gas: level 3) for about 12 minutes. Mix half of the sour cream and marzipan with the whisks of the hand mixer.
Add the remaining sour cream, cream and sauce powder and beat until stiff. Pour the cream into a piping bag with perforated spout. Spray several tuffs onto half of the puff pastry strips, interspersed with a few peach wedges. Place the rest of the puff pastry strips on top as a lid. Dust with icing sugar and decorate with flaked almonds. Serve decorated with mint as desired