Methods
1. Dissolve hot chocolate powder in boiling water and stir well.
2. Add the chocolate to the dissolved hot chocolate water and melt.
3. Finally, pour in all the other ingredients and stir well.
Note: McDonald's hot chocolate is made by machine and all the ingredients are configured, the above is a personal creation, the taste is not much different from McDonald's hot chocolate.
Additionally, it's even better if you use a shaker to shake up the bubbles.