Mix 500 g flour, 75 g sugar, 1 vanillin sugar and 1 pinch of salt. Add 75 g butter in flakes and egg. Warm the milk lukewarm. Crumble yeast into it and dissolve it. Pour into the flour mixture and knead everything smooth with a hand mixer. Cover and leave to rise in a warm place for approx. 30 minutes
Line 2 baking trays with baking paper. Mix 125 g flour, 75 g sugar, 1 vanillin sugar, 1 pinch of salt and 75 g butter in flakes first with the dough hooks of the hand mixer and then briefly with your hands to form crumbles
Dust the yeast dough with a little flour, form into a roll and divide into 15 pieces. Form into round talers (approx. 8 cm Ø) with floured hands, place on the trays. Spread crumbles on top. Cover and leave to rise in a warm place for about 15 minutes
Bake in the preheated oven (electric oven: 175 °C/circulating air: 150 °C/gas: level 2) for approx. 25 minutes. Let them cool down
Cut the crumbled thalers in half horizontally. Mix the cream and sauce powder briefly with the hand mixer on the lowest setting, then beat until stiff on the highest setting. Pour into a piping bag with a large star-shaped spout. Spray vanilla cream onto the lower halves of the thalers. Place the lid on top. Serve crumbled thalers dusted with icing sugar