01 -
Combine butter and white chocolate in a microwave-safe bowl and melt in 20-second intervals, stirring until smooth and fully melted.
02 -
In a separate bowl, whisk together eggs, brown sugar, and granulated sugar until thick, creamy, and pale in color.
03 -
Slowly add the melted butter and white chocolate mixture to the egg and sugar mixture, folding gently to incorporate.
04 -
Sift together flour, matcha powder, baking powder, and salt, then fold into the wet ingredients until just combined and no flour streaks remain.
05 -
Fold in vanilla extract evenly throughout the batter.
06 -
Pour batter into a parchment-lined 9x9 inch baking pan and bake at 325°F (160°C) for 20 to 25 minutes, or until a toothpick inserted in the center comes out with a few moist crumbs.
07 -
Allow brownies to cool completely, preferably chilled in the refrigerator for several hours or overnight, before slicing into 16 squares.