Prepare a 20 or 23 cm square slice tin with baking paper, spray a little cooking spray on the tin to help the paper stick, set aside
In a large microwave proof bowl add the chocolate broken into chunks, the condensed milk and the diced butter
Microwave for 1 minute and stir
Microwave for a further minute and stir really well, combining all the ingredients
If lumps of chocolate remain microwave for 20 second bursts until no lumps remain and all the ingredients are fully combined
Pour into the prepared slice tin and smooth to spread
Chill in the refrigerator for 6 hours, or overnight
Once set, slice into small squares and serve!
You can store in an airtight container in the fridge for up to 2 weeks, this can also be frozen as per my notes.
