Using a fine mesh strainer or sifter, sift your matcha powder into a mug to remove any clumps.
Heat ⅓ cup water in the microwave until boiling (about 45-60 seconds), then pour the hot water carefully into the mug with the matcha. Using the matcha whisk, whisk for about 30 seconds until well combined.
Heat the milk in the microwave in 30-second increments or on the stove until just steaming (do not boil). Pour in the milk and the syrup (if using). Stir, then drink up!