Preheat oven to 190C.

Butter 2 remekins and dust them with 1 tablespoon of matcha powder. Tap off the excess.

Double boil white chocolate and unsalted butter. Remove the chocolate from heat once melted.

Whisk in matcha powder and egg into melted white chocolate mixture. Make sure there is no upms of matcha powder in the batter.

Fold in all-purpose flour and divide it among the remekins. Bake for 6 - 7 minutes until the top is just firm to touch.

Working quickly, tilt the remekin onto prepared plates and shake it lightly to remove the cake. Once out, dust with powdered sugar and serve warm.