INGREDIENTS
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2 cups cake flour
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2 teaspoons baking powder
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1 teaspoon fine salt
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12 tablespoons unsalted butter (1 1/2 sticks), at room temperature
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1 1/2 cups granulated sugar
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1 vanilla bean, split lengthwise and scraped, seeds reserved (or 1 tablespoon vanilla extract)
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2 large egg whites, at room temperature
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2 large eggs, at room temperature
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3/4 cup whole milk, at room temperature
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Salted Caramel Frosting