Preheat the oven to 180°C.
In a bowl, mix all-purpose flour, baking powder, and salt.
Add cold butter and crumble it with your hands.
Pour in milk and Greek yogurt, then knead the dough.
Shape the dough into a round and flatten to 2cm thickness.
Cut into triangles and place them on a baking tray.
Bake in the oven at 180°C for 20 minutes.