Grind the oats finely in a blender.
In a bowl, combine the oats, flour, baking powder, salt, and sugar.
Add cold butter and crumble it into the mixture with your hands.
Add milk and egg to form the dough into one ball.
Flatten the dough and cut into rounds or triangles, then place on a pan.
Bake in a 180°C oven for 20~25 minutes until golden brown.