01 - Preheat the oven to 350°F. Line an 8x8-inch baking pan with parchment paper, allowing overhang on all sides for easy removal later.
02 - In a medium bowl, whisk together the flour, matcha powder, baking powder, and salt until fully incorporated.
03 - In a large bowl, whisk the melted butter and sugar until smooth and well combined. Add eggs one at a time, whisking thoroughly after each addition. Stir in the vanilla extract.
04 - Gradually fold the dry ingredients into the wet mixture using a spatula. Mix until just combined and no dry streaks remain. Take care not to overmix.
05 - Gently fold in the chopped white chocolate until evenly distributed throughout the batter.
06 - Pour the batter into the prepared pan. Use an offset spatula to spread the batter evenly, ensuring it reaches all corners.
07 - Bake for 22-25 minutes. The brownies are done when a toothpick inserted in the center emerges with a few moist crumbs but not wet batter.
08 - Allow the brownies to cool completely in the pan. Once cooled, lift them out using the parchment overhang and cut into 12 equal squares.