Combine the chocolate and the toffee in a larger food processor and process until it's almost completely broken down.
Add in the remaining ingredients and process until powdered; this will take a while so have patience and just let the food processor chop it all up. I usually leave some little chunks to melt in my powder.
To use: Add the hot chocolate powder to taste in a cup of hot water. Since we use milk powder, you don't need to use milk. Store in an airtight container for 6 weeks (or more), but it won't last that long!