For the oatmeal cookies, heat the butter in a saucepan, stir in the oatmeal and let cool.
Stir in the sugar and the eggs. Mix the flour with the baking powder and stir in as well.
Make small mounds of the mixture on a baking sheet and flatten with a spoon.
Bake the oatmeal cookies on the middle shelf at 200 °C for about a quarter of an hour.