How to Make It
Preheat oven to 350°F. Line 2 baking sheets with parchment paper. Beat the butter, vanilla, and ¾ cup of the powdered sugar with an electric mixer on medium until light and fluffy, about 2 minutes. Gradually add the flour and salt; beat on low until just combined. Add the nuts and beat on low until just combined, about 1 minute.
Shape the dough into 36 balls (about 2 tablespoons per ball) and place on the baking sheets.
Bake until firm and lightly brown, 16 to 18 minutes.
Cool on the baking sheets 5 minutes. Whisk together the matcha and the remaining 1 cup of powdered sugar in a large bowl. Gently roll the warm cookies in the matcha mixture. Cool on wire racks completely, about 20 minutes. Roll the cookies 1 or 2 more times in the sugar mixture to coat completely.