To divide our chocolate base into individual portions, we rolled it into small balls and froze them. Plopping the frozen balls in warm milk resulted in a lukewarm drink. Adding the frozen balls to cold milk and heating the mug in the microwave was a far superior method.
Microwave chocolate chips, cream, and salt in large bowl, stirring occasionally, until smooth, about 2 minutes. Refrigerate until firm, about 2 hours.
Working with 3 tablespoons chilled chocolate mixture at a time, roll into 2-inch-diameter balls. Wrap balls individually in plastic wrap and transfer to zipper-lock bag. (Balls can be refrigerated for up to 5 days or frozen for up to 2 months.)
To make 1 cup of hot chocolate: Place 1 unwrapped chocolate ball and 1 cup milk in mug. Microwave, stirring occasionally, until smooth, about 2 minutes. Serve.
