INGREDIENTS
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2½ cups cake flour
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¾ cup all-purpose flour
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1 tablespoon baking powder
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1 teaspoon baking soda
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¾ teaspoon salt
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½ cup (1 stick) unsalted butter, softened
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½ cup vegetable shortening
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1¾ cups white sugar
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1 tablespoon pure vanilla extract
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1 large egg
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1½ cups ice cold water
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3 large egg whites, room temperature
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¼ teaspoon cream of tartar
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6 ounces white chocolate, coarsely chopped
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1½ cups white sugar
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⅓ cup all-purpose flour
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1½ cups milk
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⅓ cup heavy cream
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1½ cups (3 sticks) unsalted butter, softened
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1 teaspoon pure vanilla extract
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