01 - Preheat oven to 350°F. Grease an 8-inch round cake pan and line the bottom with parchment paper.
02 - In a medium bowl, sift together the all-purpose flour, matcha green tea powder, baking powder, and salt. Set aside.
03 - In a large bowl, whisk the eggs and granulated sugar together until the mixture turns pale and fluffy, approximately 2 to 3 minutes.
04 - Add the melted unsalted butter and vanilla extract to the egg mixture, stirring until evenly incorporated.
05 - Alternately fold in the sifted dry ingredients and whole milk, beginning and ending with the dry mixture. Stir just until combined to avoid deflating the batter.
06 - Pour the batter into the prepared cake pan and smooth the surface with a spatula.
07 - Bake for 30 to 35 minutes, or until a toothpick inserted into the center of the cake comes out clean.
08 - Allow the cake to cool in the pan for 10 minutes, then transfer it to a wire rack to cool completely.
09 - Dust the top with powdered sugar and serve with whipped cream or fresh berries if desired.