INGREDIENTS
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1 large baking potato
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2 cups sugar
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1 3/4 cup cake flour
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1 1/2 teaspoon baking soda
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4 ounces unsweetened chocolate, melted and cooled a little
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4 ounces unsalted butter, softened
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1 teaspoon vanilla extract
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2 large eggs
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3/4 cups buttermilk
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4 ounces bittersweet chocolate
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1/3 cup half and half