INGREDIENTS
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1 box yellow cake mix (16.5 ounce size)
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ingredients called for on box to make cake plus 1 extra egg
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1 teaspoon ground cinnamon
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1/2 teaspoon ground nutmeg
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1/2 teaspoon ground allspice
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1 cup brown sugar
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1/2 cup heavy cream
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4 Tablespoons butter, cubed
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1 cup powdered sugar
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1/4 teaspoon vanilla extract