Place the matcha powder into a fine mesh sieve over a small bowl or cup and sift to remove lumps, ensuring a smooth, bright green powder.
Pour hot water over the sifted matcha and whisk vigorously with a small whisk until the mixture is bright green, smooth, and slightly frothy, about 30 seconds.
Add honey (or your preferred sweetener) to the matcha and stir until fully dissolved, tasting and adjusting sweetness as desired.
Fill a glass with large ice cubes and pour the milk over the ice, creating a chilled, creamy base.
Transfer the frothy matcha paste into a blender, add the milk and ice mixture, and blend on high speed until frothy and well combined, about 20 seconds. You should see a vibrant green foam form on top.
Pour the blended matcha latte into the prepared glass, allowing the frothy top to settle and create an inviting layered appearance.
Garnish with a light sprinkle of matcha or a small mint leaf if desired, and serve immediately for the freshest flavor and best froth.