Cream together peanut butter, butter, and both lots of sugar in a large bowl.

Mix through your egg and vanilla.

Add your remaining ingredients and mix well until just combined.

Taking a small spoonful at a time, roll dough into balls. Flatten slightly then arrange onto a lined baking tray, leaving a little space between each one, as they will get bigger as they bake.

Set in the fridge for 20 minutes to firm up. While waiting, preheat your oven to 170 degrees celcius.

Bake the cookies in batches for 8-10 minutes or until lightly golden and they are just firming up on the edge.