Preheat oven to 170 deg C. Line a 23 x 13cm loaf pan with parchment paper. Sift flour, baking powder and matcha powder together and set aside.

Beat butter and icing sugar together with a handheld electric mixer till light and fluffy, takes about 8 minutes. Gradually add eggs and beat well.

Sift in flour mixture the second time into egg mixture in 2 portions and fold through completely with a rubber spatula.

Pour half of the batter into prepared loaf pan and spread some red bean paste over it. Then top up with the remaining batter and smooth evenly with a rubber spatula.

Bake in the preheated oven for about 40 minutes or a skewer into the center of the cake comes out clean.

Remove the cake in loaf pan after baked, then cool the cake completely on wire rack. Lastly dust some matcha powder over the cake before slicing.