Jiggly & Fluffy Taiwanese Castella Sponge Cake - Bánh Bông Lan Castella

Taiwanese Castella Cake Recipe (mold size: 15 x 15 x 7 cm)4 eggs (medium)60g sugar (5 tbsp)50g vegetable oil (4 tbsp)70g milk (5 tbsp)60g cake flour / all pu...