Preheat the oven to 340°F (170°C) and line an 8x8-inch square baking pan with parchment paper.NOTE: When I line the pan, I leave a bit of parchment paper hanging over the edges; it makes lifting the brownies out so much easier (check the photos above).
In a mixing bowl, sift flour and matcha powder. Set aside.
In a different bowl, whisk sugar with eggs until they become fluffy and creamy, then whisk in the melted butter and pandan extract.
Gently fold in the dry ingredients until just combined (avoid overmixing to keep the texture light).
Fold in the chopped white and dark chocolate and then pour the batter into the baking pan. I like to gently tap the baking pan on the counter twice to release any trapped air bubbles.
Bake for 25-35 minutes; let it cool in the pan COMPLETELY before cutting.
Notes
To store: Keep them at room temperature for up to 2 days, or in an airtight container in the fridge for up to 4 days.