Brew a shot of espresso or prepare a strong dark coffee. Set aside for a moment to sit and stay hot.
In a small saucepan, gently heat the milk over medium-low heat until it begins to steam, with tiny bubbles forming around the edges—about 60°C/140°F. Do not let it boil.
Whisk in the cocoa powder until the mixture is smooth and slightly thickened, creating a rich, chocolatey aroma.
Add the peppermint extract to the milk mixture, starting with 1 teaspoon and adjusting to taste; whisk well to combine the refreshing flavor.
Pour the brewed coffee into your mug, filling it about halfway.
Froth the peppermint-infused milk using a frother or small whisk until it becomes light, airy, and velvety—about 30 seconds of vigorous whisking.
Gently pour the frothy, chocolate-peppermint milk over the coffee, using a spoon to hold back the foam if necessary, creating a layered effect.
Top the drink with a generous swirl of whipped cream, then drizzle with chocolate syrup or sprinkle shavings for extra decadence.
Finish by garnishing with a fresh mint sprig for a bright, aromatic touch.
Enjoy your cozy, festive peppermint mocha immediately, savoring the rich chocolate, cooling peppermint, and creamy foam with each sip.