Start with preheating your oven to 356 °F (or 180 °C).
In a mixing bowl, cream ½ a cup of granulated sugar (115 grams), ½ a stick of butter (58 grams), and ¼ tsp of salt. Use a wooden spoon, stand mixer, or hand mixer.
Add in one egg, and mix.
When the egg is incorporated into the sugar/butter mixture, take a sieve and sift 1 cup of all-purpose flour, 1½ tbsp of matcha- and ½ tsp of baking powder. Add to the mixing bowl and mix until you have a smooth and green cookie dough.
Either use a cookie scoop, a tablespoon, or your hands and scoop around 2 tbsp of cookie dough. Form a small ball and put it on a plate.
Optional: Put the plate in the fridge for about half an hour to cool the dough.
Take two small bowls, add ¼ cup of granulated sugar to one, and ½ a cup of powdered sugar to the other.
If you put your dough balls in the fridge take them out after at least an hour.
Take the matcha cookie dough balls and roll them first through the granulated sugar and then through the powdered sugar.
Place the balls on your baking tray and keep a bit of space as the cookies will lightly spread when baking.