Use a kitchen scale for precise measurements for perfect texture., Bake at a low temperature (300°F) to prevent browning or bitterness and to keep cookies tender., Prick cookies before baking to help them bake evenly and maintain a smooth surface., Store cookies in an airtight container to preserve their bright green color and freshness; they keep well for about 10 days., The color of the cookies will fade over time due to exposure to air and light., You can make the dough up to 3 days ahead; chill tightly wrapped, then roll, cut, and bake fresh., Baked cookies freeze well; cool completely before freezing in an airtight container or freezer bag., For variation, add white chocolate chips, drizzle white chocolate, or mix in chopped toasted almonds or pistachios., You can substitute vanilla bean paste with an equal amount of pure vanilla extract., Unsalted butter is preferred to control salt level., Try gluten-free all-purpose flour blend for gluten-free version, but texture may vary., Recommended matcha brand options: Jade Leaf Matcha (smooth, balanced), Whole Foods 365 (slightly more bitter), avoid Sunfood matcha (harsh aftertaste).