Line a tray with aluminum foil and ensure that there is foil left hanging over the sides.
Break up your chocolate into small chunks. Place into a microwave safe bowl and add butter.
Microwave for 10-20 seconds at a time until the chocolate and butter are melted.
Add in vanilla extract.
Add powdered sugar or confectioners sugar into the mixture. Use a sieve to ensure that your mixture will be lump free.
Add a few teaspoons of milk and mix further.
Pour mixture into your lined tray.
Leave the mixture to cool down fully before putting it into the refrigerator to set.
Place into the refrigerator for a minimum of 3 hours.
Remove from the refrigerator and cut fudge into equal pieces to serve.