Pour milk into a blender. Add hot cocoa mix and crushed ice.
Blend at low speed for a few seconds. Increase to high speed and blend until the ice is finely crushed.
Pour into a tall glass and top with whipped cream and cocoa mix, if desired. Serve and enjoy!
Notes
For best results, prep all ingredients before starting this frozen hot chocolate. Taste as you go and adjust seasoning or sweetness to your preference. Store leftovers properly and enjoy within a few days for the best texture.