Cut the almonds in half lengthwise with a knife. Separate the egg. Mix egg white, marzipan, icing sugar, flour and baking powder with the whisks of the mixer to a smooth mixture.
Preheat oven (electric cooker: 175°C/circulating air: 150°C/gas: level 2). Line a baking tray with baking paper. With moistened hands (the dough is sticky) form about 20 "fingers" of different length (6-8 cm long) and place them on the baking tray.
Press one almond half at one end of each finger as a fingernail. Whisk the egg yolk and cream, spread on the pastry.
Bake the marzipan fingers in the oven for 15-20 minutes. Let them cool down.