What main ingredient is used in a green tea latte?

The main ingredient used in a green tea latte is matcha green tea powder. This finely ground powdered form of specially grown and processed green tea leaves is what gives a green tea latte its distinct flavor and vibrant green color. Matcha is known for its rich antioxidant properties and a unique umami flavor that differentiates it from regular green tea. When prepared in a latte, it is typically mixed with steamed milk to create a creamy texture, while retaining the nutritional benefits of the matcha. Other options like espresso, regular coffee, and hot chocolate do not contribute the signature taste or characteristic of a green tea latte, as they are not based on green tea at all.