Sift matcha powder into a small bowl to remove any clumps. Add the hot water and whisk vigorously until the matcha is fully dissolved and frothy. Stir in sugar until dissolved. Pour the mixture into a glass.
Fill the glass with ice cubes. Gently pour milk over the ice.
Slowly pour the prepared espresso over the milk, with care not to break up the layers.
Enjoy your matcha coffee latte immediately! Stir before drinking if you prefer a blended flavor.