Preheat the oven to 200°C (392°F).
Combine flour, baking powder, sugar, and salt in a bowl and mix together.
Cut cold butter into small pieces and rub it into the mixture with your fingertips.
Mix milk and egg together, then pour it into the dough and stir until it forms a single mass.
Roll out the dough thickly with a rolling pin and cut into triangles or circles.
Place on a baking pan lined with parchment paper.
Bake in the oven at 180~200°C (356~392°F) for 15~20 minutes.