Pick fresh raspberries, wash and pat dry well. Let frozen raspberries thaw so they don`t get mushy. Pour off any excess juice.
Preheat the oven to 180 ° (convection 160 °).
Mix the flour with the custard powder, baking powder and baking soda. In a second bowl, beat the eggs with sugar until frothy, then stir in the oil and buttermilk. Add the floury ingredients to the liquid ingredients and stir in with a whisk. Then carefully fold in the chopped couverture and raspberries. Fill the dough into 12 molds and bake immediately for 20-30 minutes.