Mix flour, salt, icing sugar, baking powder and ground almonds in a bowl. Add 1 egg and butter. Knead first with the dough hooks of the hand mixer, then with your hands to a smooth dough.
Grease 6 Tartelettes (approx. 10 cm Ø; with lift-off base) and dust with flour. Divide the dough into 6 portions of equal size. Roll out round (13-14 cm Ø) on a floured work surface or press flat by hand.
Line the ramekins with it, press down at the edges and chill. Mix sour cream, milk, 1 egg and 2 tablespoons of sugar until smooth. Wash the apricots, dab dry, halve, stone and cut into thin slices.
Sprinkle each base in the mould with about 1/2 teaspoon of sugar and place on a baking rack. Distribute the apricot slices in the baking tin. Pour a sand casting over them. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 20-25 minutes.
Cover with aluminium foil at the end if necessary. Roast the flaked almonds in a pan without fat until golden brown, let them cool down. Remove the tartlets, let them cool down on a cake rack, take them out of the moulds and sprinkle them with almonds.