INGREDIENTS
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4 cups all-purpose flour
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3 cups white sugar
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5 teaspoons baking powder
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1/2 teaspoon baking soda
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1/4 teaspoon salt
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1 2/3 cup milk
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1 cup shortening
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1/2 cup Champagne
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1 tablespoon vanilla extract
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8 egg whites
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2 cups sugar
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8 large egg whites
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4 cups (2 pounds) unsalted butter, cubed, at room temperature
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1 tablespoon vanilla extract