Preheat the oven to 180°C (356°F).
In a bowl, mix whole wheat flour, baking powder, and salt.
Cut the cold butter into small pieces and mix quickly with your fingertips until crumbly.
Add Greek yogurt and milk, and gently mix until the dough comes together.
Flatten the dough and cut into 4 pieces.
Place the pieces on a baking tray lined with parchment paper.
Bake in the preheated oven for 20–25 minutes.