– 2 ¾ cups cake flour (spooned & leveled) (305 grams) – 1 tablespoon baking powder – ¾ teaspoon salt – 1 cup buttermilk at room temperature (240 ml) – 2 teaspoons clear vanilla extract or pure vanilla extract – 1 cup unsalted butter softened (230 grams) – 1 ¾ cups granulated sugar (350 grams) – 5 large egg whites at room temperature
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