Use warm—not boiling—water to avoid bitterness. Whisk the matcha before adding it to the milk for the smoothest texture. For a café-style version, use oat milk and a splash of vanilla. A latte made with 1 teaspoon of matcha contains about 38–70 mg caffeine, while 1/2 teaspoon provides about 20–35 mg and 2 teaspoons about 80–140 mg.