A couple hours before you're ready to make your frozen hot chocolate, make the hot chocolate according to the package directions.
Pour the hot chocolate into an ice cube tray and place in the freezer until frozen.
Once your hot chocolate is frozen in the tray, when you're ready to make your frozen hot chocolate, simply pop about 6 cubes out of the tray and place them into the blender.
Add the milk, and chocolate syrup to the blender and blend on high for about 30 seconds.
Add a little extra milk if you need to.
Pour into a frozen mug and top with whipped topping and a drizzle of chocolate syrup.
Enjoy!