In a serving cup, combine together the cocoa powder, sugar, and cinnamon. Whisk in 1 tablespoon milk or cream and vanilla extract to make a paste; set aside.
In a small saucepan over medium-low heat, heat the 1 cup milk (being careful not to scorch it). Remove from heat and pour the hot milk into the cup with the cocoa mix; stir or whisk until well combined.
Place topping of your choice on top of the hot chocolate.
Variations: Peppermint or vanilla sticks may be added.
* I prefer Droste Chocolate powder, but use your favorite.
** To make marshmallow shapes, dust wax paper with confectioner's sugar. Place the marshmallow onto the wax paper and roll to flatted. Cut out desired shapes with a cookie cutter.
Ellen's Hot Chocolate Recipe: https://whatscookingamerica.net/EllenEaston/HotChocolate.htm