01 - Preheat the oven to 350°F (175°C). Line an 8x8-inch (20x20 cm) baking pan with parchment paper, leaving some overhang for easy removal.
02 - In a medium bowl, whisk together the flour, matcha powder, baking powder, and salt until well blended.
03 - In a large bowl, whisk the melted butter and sugar until well combined. Add the eggs one at a time, whisking after each addition, then stir in the vanilla extract.
04 - Gradually fold the dry ingredients into the wet mixture until just combined. Do not overmix to maintain fudgy texture.
05 - Gently fold in the chopped white chocolate until evenly distributed throughout the batter.
06 - Pour the batter into the prepared pan and spread evenly with a spatula, ensuring smooth surface.
07 - Bake for 22-25 minutes, or until a toothpick inserted in the center comes out with a few moist crumbs. Avoid overbaking for fudgy results.
08 - Allow to cool completely in the pan before lifting out using parchment overhang and cutting into 12 equal squares.