Ingredients 8 tbsp plain flour 2 tbsp caster sugar 2 tbsp crunchy peanut butter 1 free-range egg yolk 50g/1¾oz butter, softened icing sugar, for dusting Preparation method Preheat the oven to 180C/350F/Gas 4. Place the flour, sugar, peanut butter, egg yolk and butter into a large bowl and mix together until combined to a smooth dough. With lightly floured hands, break off evenly sized pieces of the dough and roll into walnut sized balls. Place the dough balls onto a baking sheet lined with silicon paper or baking parchment and gently press each ball with the back of a fork to flatten slightly. Place in the oven and bake for ten minutes, or until just turning golden-brown. Transfer the cookies to a wire rack and allow to cool for ten minutes. To serve, place on a serving plate and dust with icing sugar.