How to make the world's softest green tea sponge cake/Taiwanese Castella...

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Green tea sponge cake/Taiwanese Castella Cake Recipe

Ingredient(1cup=240ml)

6 egg
flour 3/4cup(90g)
Green Tea Powder 1Table spoon+ 1 teaspoon(10g)
Vegetable oil 75ml(60g)
milk 100ml
Sugar 1/2cup+2Table spoon(120g)