INGREDIENTS
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1 cup cake flour
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3/4 cup sugar
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1 1/2 teaspoons baking powder
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1/2 teaspoon salt
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1 teaspoon pumpkin pie spice
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1/3 cup pumpkin puree
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2 tablespoons vegetable oil
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1/2 teaspoon vanilla extract
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3 large eggs, separated
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1/2 teaspoon cream of tartar
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1 cup whole milk
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3 tablespoons all purpose flour
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1/2 cup shortening
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1/2 cup unsalted butter, room temperature
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1 cup sugar
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1 teaspoon vanilla extract
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1/2 teaspoon salt
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1 cup confectioners' sugar
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4 tablespoons maple syrup
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3 tablespoons heavy cream
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2 teaspoon bourbon