01 - Roast or steam the sweet potato until tender throughout. Allow to cool, remove peel, and cut into chunks.
02 - Combine sweet potato chunks, milk, sweetener if using, and vanilla extract in blender. Process until completely smooth and creamy.
03 - Transfer blended mixture to saucepan. Warm over medium-low heat, stirring occasionally, until steaming hot. Avoid boiling to prevent separation.
04 - Pour hot latte into mugs. Dust with cinnamon or nutmeg if desired. Serve immediately while hot.