Place the puff pastry slices next to each other and defrost at room temperature for about 10 minutes. Mix sugar, vanillin sugar, salt and flour. Put milk and fat in a pot and bring to the boil. Add the sugar mixture to the milk while stirring vigorously. Bring to the boil once briefly, remove from the stove.
Pour into a bowl, cover with foil and set aside, let cool down a little. Cut out 2 circles (9 cm Ø) from each of the dough slices, roll out slightly larger if necessary. Grease a muffin tin (12 troughs). Line it with the dough circles, press it down well. Put them in a cold place. Wash, halve and stone the apricots. Stir egg and egg yolks into the cream. Spread the cream in the hollows, add 2 apricot halves each. Bake in the preheated oven (electric cooker: 225 °C/ convection oven: 200 °C/ gas: level 4) for 15-20 minutes.
Wash, halve and stone the apricots. Stir egg and egg yolks into the cream. Spread the cream in the hollows, add 2 apricot halves each. Bake in the preheated oven (electric cooker: 225 °C/ convection oven: 200 °C/ gas: level 4) for 15-20 minutes. Allow to cool briefly, remove the tartlets from the troughs and let them cool on a cake rack. Serve dusted with icing sugar