Process all of the ingredients in a food processor until ground to a powder, 30 to 60 seconds. Transfer to an airtight container and store at room temperature for up to 2 months.

To Make Hot Chocolate: Heat 1 cup of milk (whole, 2% or 1%) in a small saucepan over medium heat until it starts to steam and bubbles appear around the edge of the saucepan. Add ¼ cup of the hot chocolate mix and continue to heat, whisking constantly, until simmering, 2 to 3 minutes longer. Pour into a mug and serve.