Add the ice cubes to the blender.
In a seperete bowl, whisk together the powdered sugar, cocoa, powdered milk and salt. Add it to the blender.
Blend until all the ingredients until combined and the mixture is smooth and thick. You may need to scarpe down the sides and use the tamper to ensure everything is blending together.
Pour into glasses or mugs and garnish with whipped cream and grated chocolate.
Makes about 2 servings.