Place the matcha powder and hot water in a heat-proof bowl and whisk well until the powder is completely dissolved and the mixture is frothy. Set aside to cool completely.
Place the milk, maple syrup, and ube extract in a separate bowl and whisk to mix.
Add ice cubes to a tall 12-ounce glass.
Pour the milk mixture into the glass.
Pour the matcha tea very slowly over the iced milk to create two distinct layers.
Serve. Gently stir the layers together before sipping and add more sweetener to taste if desired.