Really simple cupboard staple biscuits. They're melt in the mouth but also will hold together enough to dip in your coffee or tea.
90g caster sugar
1 egg
170g plain flour
1 tsp vanilla extract
50g peanuts (finely chopped)
You will also need 2 lined baking trays.
Cream together the peanut butter, butter, sugar and vanilla together in the bowl of a food processor (or freestanding mixer, or by hand) until light and fluffy. Add the egg, pulse until well combined.
Add the flour and pulse until it comes together to form a ball.
Tip the mixture out onto a sheet of baking parchment, mix in the chopped peanuts. Roll into a cylinder and wrap in the parchment.
Chill until firm, for a minimum of 60 minutes. Cut into thickish disc's, place onto the lined baking sheets, use a fork to make a criss cross effect on the tops.
Preheat the oven to 170ºC/325ºF/gas mark 3.