The grade or quality of the matcha can impact the taste and color of your matcha infused product. For these cookies, I like to use ceremonial grade matcha as it yields the best flavor and color. You can use culinary grade matcha, but note that it will have more bitter undertones to it. And unless you are using a very vibrant green culinary grade matcha, you will likely have a more dull or muted green color to your cookie.