• 200 g (7 oz) plain (all-purpose) flour
• 75 g (2½ oz/⅓ cup) caster (superfine) sugar
• 2 tablespoons crunchy peanut butter
• 1 egg yolk
• 50 g(1¾ oz) lightly salted butter, softened

PREHEAT THE OVEN TO 180°C (350°F/GAS 4). Combine all the ingredients together in a mixing bowl and work them together with an electric beater until you have a smooth, uniform dough.

LINE A BAKING TRAY WITH A SHEET OF BAKING PAPER OR A SILICONE MAT. Shape the dough into walnut-sized balls, placing them on the baking tray as you go. Press them lightly with the back of a fork to mark them lightly.

BAKE THE COOKIES FOR 10 MINUTES, UNTIL GOLDEN BROWN. When they come out of the oven, let them cool on a rack before eating.