Place the flour, sugar, peanut butter, egg yolk and butter into a large bowl ... or until just turning golden-brown. Transfer the cookies to a wire rack and allow to cool for ten minutes.
Add the egg and yolk and beat for another minute until smooth ... Preheat the oven to 180C/160C Fan/Gas 4. Bake the cookies in batches of 5 or 6, leaving plenty of space between them as they ...