01 - Preheat oven to 350°F. Line an 8x8-inch baking pan with parchment paper, leaving overhang for easy removal.
02 - In a medium bowl, whisk together flour, matcha powder, baking powder, and salt until evenly blended.
03 - In a large bowl, whisk melted butter and sugar until smooth. Add eggs one at a time, whisking thoroughly after each addition. Stir in vanilla extract.
04 - Gradually fold dry ingredients into wet mixture until just combined. Avoid overmixing to maintain fudgy texture.
05 - Gently fold chopped white chocolate into the batter until evenly distributed.
06 - Pour batter into prepared pan and spread evenly. Bake for 22-25 minutes until a toothpick inserted in center comes out with moist crumbs.
07 - Allow to cool completely in the pan before lifting out using parchment overhang. Cut into squares before serving.