Add all ingredients to a 500mL mason jar. Microwave on high for 1 minute and whisk until melted and smooth, heating for another 15-20 seconds on high if necessary to get the chocolate completely smooth.
Place lid on jar and refrigerate 6-8 hours or overnight until completely chilled.
Once chilled, shake for 3-5 minutes until desired consistency is reached. That's it! (You can also use an electric mixer to make things easier).