Line a 9” square cake tin with parchment paper and preheat the Airfryer to 150c (or 170c oven).
In a large bowl, mix the butter and sugar until combined before adding the flour and mixing.
The mixture will be crumbly.
Add the chopped chocolate buttons to the mixture and press this into the tin.
Bake for 18-24 minutes in the air fryer (keep an eye!) and 22-26 in the oven.
Enjoy!
