Preheat the oven to 190°C.
Combine cake flour, sugar, baking powder, and salt in a bowl.
Add cold butter and mix with your hands until evenly crumbled.
Add milk and egg, mix well to form a dough.
Shape the dough into a round and flatten to about 2-3 cm thickness.
Cut into desired serving sizes and place on the oven pan.
Bake in the oven at 180-190°C for 20 minutes.