Preheat the oven to 170 C /Gas 3. Grease 2 baking trays or line with parchment.
Sift the flour into the bowl and add in the butter and sugar; rub well.
Add the egg and milk, stir together till crumbly; blob mixture onto your baking tray.
Bake in the preheated oven until the edges are lightly toasted, for 30 to 35 minutes. Cool on baking trays for a few minutes before transferring them to a wire rack to cool completely.