"If you can't find sweet potato puree, make your own using either baked or canned whole sweet potatoes. Puree in a processor until completely smooth...."
INGREDIENTS
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4 tablespoons (1/2 stick) unsalted butter
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2/3 cup natural unsweetened cocoa powder
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1/2 cup whole-wheat pastry flour
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1/4 teaspoon baking powder
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1/4 teaspoon salt
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1 cup sugar
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2/3 cup sweet-potato puree
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1 large egg
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1 1/2 teaspoons vanilla extract
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1/4 teaspoon instant coffee powder