01 - Roast or steam the Korean sweet potato until completely tender throughout. Allow to cool until safe to handle, remove peel, and cut into chunks for easy blending.
02 - Combine the sweet potato chunks, milk, sweetener if using, and vanilla extract in a blender. Process on high speed until the mixture achieves a completely smooth, uniform consistency without any remaining lumps.
03 - Transfer the blended mixture to a saucepan and warm over medium-low heat, stirring frequently to prevent scorching. Heat until steaming but not boiling—approximately 3–5 minutes.
04 - Pour the hot latte into mugs and dust with cinnamon or nutmeg if desired. Enjoy immediately while hot.