set oven at 180*c ,350*f . cream butter until soft ,then gradually beat in sugar and continue to beat until light and fluffy . add egg ,peanut butter ,salt and bicarbonate of soda and mix well .

add vanilla essence to mixture and blend in flour . roll mixture into balls and place on lightly greased baking sheet . flatten with floured fork .

bake for 10-12 minutes , until lightly golden . cool no wire sack .