01 - In a small saucepan, whisk cocoa powder, sugar, and hot water over medium heat until smooth and dissolved, about 2 minutes.
02 - Stir in the milk and heat until steaming but not boiling, then remove from heat.
03 - Add peppermint extract and brewed coffee or espresso, stirring well to blend flavors.
04 - Divide the mixture evenly between two mugs.
05 - Top with whipped cream, chocolate shavings, and crushed peppermint candies if desired, then serve immediately.