01 - In a small saucepan over medium heat, combine milk, brown sugar, cinnamon, nutmeg, ginger, and vanilla extract. Whisk constantly until milk is steaming and sugar dissolves, avoiding boiling.
02 - Brew espresso or strong coffee and divide evenly between two mugs.
03 - Froth the warmed spiced milk using a frother, whisk, or by shaking vigorously in a heatproof jar.
04 - Pour the frothed spiced milk over coffee in each mug. Top with whipped cream and a sprinkle of cinnamon or nutmeg if desired. Serve hot.