In a saucepan, heat the whole milk, granulated sugar, cocoa powder, and peppermint extract until boiling. Remove from heat.
Using a milk frother or immersion blender, froth the mixture.
Pour the peppermint chocolate mixture over your brewed coffee or espresso.
Top with whipped cream, crushed candy canes, and/or chocolate shavings if desired!
Notes
This recipe can easily be doubled to make two lattes!
If froth is not a priority for you, you can definitely use a lower-fat or plant-based milk in place of the whole milk.
If you don't have a frother, give the peppermint chocolate milk a vigorous whisk until it bubbles. Or, you can (carefully, with not-too-hot milk) pour it into a large jar and give it a good shake to create a foam!