Preheat the oven to 180°C (356°F).
In a bowl, mix cake flour, baking powder, sugar, and salt.
Add cold butter and mix well using your hands or a scraper until the butter is crumbled into the flour.
Add egg and milk, then gently mix to form the dough.
Roll out the dough to a thickness of 2cm and place it on a baking pan.
Cut into your desired shapes and brush lightly with milk.
Bake in the oven at 180°C (356°F) for 18–20 minutes until done.