Place the milk in a saucepan with 22mint sprigs and bring to the boil. Remove from the heat, cover and leave to infuse for 5 minutes.
Discard the mint and stir the sugar into the milk until dissolved. Leave to cool completely.
Pour the milk into a blender and add the chocolate powder. Process until blended and forthy.(Or use and electric beater.) Pour into 4 glasses over ice cubes and top each with a swirl of cream. Garnish with the remaining mint and serve.
Serving Size 4
* Percent Daily Values are based on a 2,000 calorie diet. Your daily value may be higher or lower depending on your calorie needs.