Preheat Oven and Grease Pan:
Heat oven to 350°F (175°C). Coat a donut pan with grease.Whisk Dry Ingredients Together:
In a big bowl, mix flour, sugar, baking powder, salt, and matcha powder with a whisk.Combine Wet Ingredients:
In another bowl, combine milk, eggs, oil, and vanilla using a whisk.Mix Wet into Dry:
Add the liquid mix to the dry mix and stir until smooth and just blended.Fill Donut Cavities:
Evenly pour the batter into the donut cavities.Bake Until Golden:
Bake for 10-12 minutes, until golden and a toothpick inserted comes out clean.Cool in Pan Then Rack:
Let donuts rest in the pan for several minutes, then move to a wire rack to fully cool.Dust with Powdered Sugar:
After cooling, sprinkle powdered sugar on top if desired.