To make these you need:
140 gm plain flour
1/2 tsp bicarb of soda
1/2 tsp salt (can skip if your butter is salty)
115 gm butter
165 gm brown sugar (powdered)
1 egg
1 tsp vanilla essence
200 gm peanut butter
All you need to do:
Sift together salt, flour, bicarb of soda and set aside. Cream the butter and sugar with an electric mixer or hand whisk until light and fluffy. In another bowl, mix egg and vanilla and then gradually beat into butter mixture. Stir in the peanut butter and mix. Stir in the dry ingredients and refrigerate it for 30 minutes. Pre-heat the oven to 180 degrees Celsius. Grease a baking tray. Spoon out rounded teaspoonfuls of the dough and roll into balls. Place the balls on the prepared sheets and press flat with a fork into circles making a crisscross pattern using the tines of the fork. Bake until lightly colored, 12-15 minutes. Transfer them to a wire rack to cool.
And you are ready with a batch of around 30 cookies.