Finely crush the oats.
Combine flour, baking powder, sugar, and salt in a bowl and mix.
Add cold butter and break it up with a fork.
Add the crushed oats, milk, and egg, then knead into dough.
Roll out the dough to 2-3cm thickness and cut into desired shapes.
Place on a baking tray and bake in a preheated 180°C oven for 20 minutes.
Cool on a wire rack.