Ultra moist and airy sponge cake

Adding the Liquid
Ingredients Gently stir in the vanilla extract, oil (or melted butter), and milk. Mix briefly, using a spatula or at very low speed, so as not to let the foam fall back.
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Sift together the flour, baking powder and salt directly over the mixture. Gently fold them in, lifting the mixture with a spatula, until you obtain a homogeneous and well-aerated dough.
Baking