To begin, line a 20cm square tray or baking tin with baking paper
Place the peanut butter and butter in a large saucepan and melt over a medium heat
Once everything has melted, add the icing sugar. It is easiest to do this in 2 parts to prevent mess
Add the salt and mix well until thoroughly combined
Spread the mixture evenly in the baking tray and cover the top with another piece of baking paper. Transfer to the fridge to set for 1 hour before cutting into squares to serve
