INGREDIENTS
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Cake
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5 large egg whites, at room temperature
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3/4 cup whole milk, divided
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2 1/2 teaspoons vanilla extract
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2 1/2 cups cake flour
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1 3/4 cups granulated sugar
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1 tablespoon PLUS 1 teaspoon baking powder
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1/2 teaspoon salt
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3/4 cup unsalted butter, at room temperature and cube
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Frosting
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1 1/2 cups unsalted butter, at room temperature
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3 1/2 cups confectioners sugar
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3 tablespoons milk
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1 1/2 teaspoons vanilla extract
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1/8 teaspoon salt
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Garnish
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1/2 cup chocolate, shaved