Wash, halve, stone and cut the plums into pieces. Mix pieces with plum puree
Melt the fat. Mix fat, salt, 125 g sugar and vanilla sugar with the whisk of the hand mixer. Separate 2 eggs, chill the egg white. Stir 2 eggs, egg yolks and milk into the fat mixture. Mix flour, almonds and baking powder, stir into the egg mixture. Fold in plums
Place paper cups in the recesses of a muffin tray (12 recesses). Pour in the dough evenly. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for approx. 15 minutes
Beat the egg whites until stiff, finally adding 75 g sugar, continue beating until the sugar has dissolved. Pour the beaten egg whites into a piping bag with a medium star-shaped spout. Remove the muffins from the oven and spray on the beaten egg whites. Bake the muffins at the same temperature for another 5 minutes. Remove from the oven and let them cool down on a cake rack