I love the flavor of green tea powder in baked European-style sweets. Lately, I've been searching for a few recipes and found this one on the internet. Typically, I use a really good quality green tea (from Toraya), but even I find the green tea flavor to be too intense, so I use the lesser amount of green tea and increase the amount of powdered sugar. For less expensive grades of tea, I just use the greater amount of tea. You can purchase green tea powder at the Japanese grocers, but it will come in a variety of grades. The lower grades will use dried spinach to boost the color, but the tea flavor will not be as intense. The cookies are bright green (like the color of spring grass); they smell lovely, but have a bitter edge to them because of the green tea. It's typically an "adult" flavor, but my kids really like them with a bit of vanilla ice cream.