Combine oatmeal, cake flour, baking powder, and salt in a bowl and mix well.
Cream together the butter and sugar, then add the egg and mix thoroughly.
Add the dry mixture and blend evenly.
Mix in nuts and dried fruits.
Shape the dough into rounds and place them on a baking tray.
Bake in a preheated oven at 180°C (356°F) for 15 minutes.