Wash the mugwort thoroughly and remove excess water.
In a bowl, mix together cake flour, baking powder, salt, and sugar.
Add cold butter and mix until combined, then add mugwort and milk, and form into a dough.
Roll the dough to a thickness of 2cm, and cut into desired portions.
Place on a baking tray and bake in a preheated oven at 180°C for 20-25 minutes.