Toast the butter, oat flakes and 2 tablespoons of sugar in a non-stick pan, stirring constantly, remove from the pan and let cool.
Mix the remaining sugar, eggs and a pinch of salt with the mixer for about 4 minutes until very frothy. Mix the flour and baking powder with the oatmeal and fold into the egg mixture.
Place small heaps with two teaspoons on a baking sheet lined with baking paper.
Bake the oat biscuits at 170 ° C (fan oven) for about 10 minutes until they are golden brown.