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Preheat the oven to 180C/160C Fan/Gas 4 and line two baking trays with baking paper. Use your hands or an ice cream scoop to form balls of dough (about 60–70g/2¼–2½oz per cookie).

Pour into the flour mixture, add the egg and stir thoroughly until the contents of the bowl come together as a soft dough. Tip the dough ... roasting tin or baking tray thoroughly with butter.