First upon take dark chocolate bar and grate it with grater. Then set the chocolate aside.

Then create a slurry of cocoa powder mixed with 2 tbsp of milk. This is going to help make sure there are no lumps of cocoa powder in your hot chocolate

Now pour milk into a saucepan on your stove and turn the heat to medium. Pour in the cocoa powder and milk slurry followed by sugar and cinnamon powder (add more sugar or less depending on your taste) Whisk everything together until the milk has warmed up and started to bubble slightly.

Now at this point add the greater chocolate and whisk until it has melted. Turn off the heat, when it reaches to your desired temparature, serve with your favourite toppings.

Now our very yummy American Hot Chocolate is ready for serve. Serve in your favourite mug with lots of marshmallows and grated dark chocolate.