Preheat the oven to 350F.

Whisk the confectioner’s sugar and green tea together in a bowl.

Add the butter, vanilla and green tea/sugar mixture to the bowl and cream till light.

Add the flour and mix until well combined.

Add the egg yolks and mix just until the eggs are fully incorporated and a mass forms.

Form the dough into a disk and chill in the refrigerator until firm (about 30 minutes).

Roll the dough out to ½” thickness.

Cut the dough with a cookie cutter.

Toss each cut cookie in a bowl of granulated sugar to coat.

Place the sugar-coated cookie on a baking tray.

Bake at 350F for 15 minutes, or until slightly golden around the edges.