Pour the buttermilk over the oat flakes, salt and sugar, stir and leave to soak for approx. 1 - 1.5 hours.
Mix flour with baking powder and add to the oatmeal. Mix all ingredients with the dough hook of the hand mixer.
Shape the dough into 8 balls, flatten them to 1 cm and place them on a baking sheet lined with baking paper. Then bake in the preheated oven for about 35 minutes at 180 ° C (fan oven 160 ° C).