place the butter and sugar in a bowl.Beat together till pale and creamy.Beat in the egg yolk.

sift in the plain flour and bicarbonate of soda and add the salt.stir untill blended ,then stir in oats.chill the mixture in the fridge for 30 mins.

preheat the oven to 190c/170f/gas 5.Line two baking sheets with baking parchment.

Drop 14 spoonfuls of the mixture,spaced well apart on the baking sheet.Gently flatten them with Ur fingers or the base of a floured glass.