200g peanut butter (smooth or crunchy is fine!)
175g Caster Sugar (while this is prefered, you can use normal sugar too)
Heat your oven to 180C and line a baking tray with greaseproof paper.
Mix the peanut butter and sugar together in a bowl until well combined.
Add the egg and mix to form a dough.
Roll them into 1 inch balls and place them a few inches apart on the sheet. Flatten them with a fork in a criss cross pattern.
Cook for 10-12 minutes until they are golden around the edges and then let them cool.
You can keep them in an airtight container for three days, or freeze the dough before baking it and cook them from frozen (by adding two more minutes to the cooking time), whenever you need a quick treat.