Mix everything together and bake in the air fryer at 180°C for 20 minutes.
Preheat the oven to 180°C.
In a bowl, mix cake flour, baking powder, matcha powder, sugar, and salt.
Add cold unsalted butter and cut it into small pieces using a scraper.
Add milk and egg, and gently bring the dough together.
Roll the dough out to 2cm thickness and cut out circles with a round cutter.
Place them on a baking tray lined with parchment paper.
Bake at 180°C for 20 minutes.