In a small saucepan, gently heat the heavy cream over medium-low heat until it's just about to simmer. Remove from heat.
Add the white chocolate chips into the hot cream and let sit for 1-2 minutes to melt.
Once melted, whisk in the matcha powder, vanilla extract, and a pinch of sea salt until the mixture is smooth and well combined.
Transfer the mixture into a bowl, cover with plastic wrap, and refrigerate for about 1 hour, or until firm enough to scoop.
Once the mixture is set, use a small cookie scoop or your hands to scoop out small balls of the chocolate mixture. Roll them quickly between your palms to form smooth truffles.
In a shallow dish, combine crushed pistachios and desiccated coconut. Roll each truffle in the mixture until fully coated.
Place the finished truffles on a parchment paper-lined baking sheet and refrigerate for another 30 minutes to firm up.
Notes
Arrange the truffles on a decorative plate and sprinkle with a little extra matcha powder and some whole pistachios for an elegant touch.