Bring butter to the boil and foam. Stir in the oat flakes, let them cool down
Beat the eggs, sugar, vanillin sugar and salt for about 8 minutes until fluffy. Mix flour and baking powder, stir in briefly. Add to the fat-oat flake mixture and stir in with a wooden spoon
Using 2 teaspoons of the oatmeal mixture, place small heaps on trays lined with baking paper. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/gas: level 2) for about 20 minutes. Cooling down