Measure how much chocolate you need. Whether you're using a chocolate bar or chocolate chip, chop the chocolate across as best you can, so that it splinters into very small pieces. Don't add it to your bowl yet.
Measure out your milk or cream into the small bowl, and heat it in the microwave for 10-15 seconds. Once heated, immediately add in the chopped chocolate in a thin layer.
Let the ingredients sit for two minutes, to allow the chocolate to slowly melt. If it doesn't sit like this for a couple minutes, the fat and the solids will begin to separate, and it will look like curdling milk.
After two minutes, stir vigorously with your spoon to combine all of the liquids and the solids. Within 10 seconds, your sauce should start to look like a shiny liquid, now all ready for dipping!