Add egg, granulated sugar, powdered sugar, vanilla extract, baking soda, tea powder, and salt. And then again, whisk for a few minutes on moderate speed.
At last, add flour and whisk at high speed to prepare the thick dough. And then leave the dough in the fridge for some time.
Line a baking tray with parchment paper. Now make flat cookies with the dough and place them on the tray.
Bake the cookies for ten minutes at 180 degrees C. After the cookies are baked, let it cool down.
In a bowl, add powdered sugar, nutmeg, cinnamon, and milk. Mix them well to make a thick glaze.
Pour the glaze on cookies and serve them by sprinkling nutmeg powder. And enjoys the delicious cookie.