In a small bowl, sift the matcha powder through a fine mesh strainer to remove any clumps.
Add the hot water to the matcha. Whisk vigorously with a bamboo matcha whisk or mini whisk until the matcha powder is fully mixed in (no lumps). Add another 3 tablespoons of cold water and whisk to combine.
Fill a glass two-thirds full with ice. Add the milk of your choice, then pour in the matcha mixture. You can sweeten the latte with 1 to 2 teaspoons of simple syrup, maple syrup or honey, if desired. Serve immediately.
Notes
Add sweetener: You can sweeten the latte with simple syrup, honey, or maple syrup or by whisking granulated sugar with the matcha powder and hot water.
Milk options: Use whole or skim dairy milk, soy milk, almond milk, cashew milk, coconut milk, or oat milk in your iced matcha latte, depending on your taste.
It's important to sift the matcha before combining it with hot water. If there are clumps present from the start, it will be much harder to whisk them into the water and break them apart.
Water temperature: When added to the matcha, the hot water should be steaming but not boiling. The ideal temperature is 180°F for matcha powder to properly disperse in water and extract the best flavor.