Prepare the oatmeal in a bowl.
Add cake flour, baking powder, sugar, and salt, then mix well.
Cut the butter into small pieces and mix by hand until crumbly.
Add milk and form the dough into a ball.
Rest the dough in the refrigerator for 30 minutes.
Divide the dough into equal portions and shape into rounds.
Bake in a preheated oven at 180°C for 20–25 minutes.