"It's an unusual cake with an exceptional flavor...."
INGREDIENTS
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1 cup sugar, divided
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1/4 cup baking cocoa
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3/4 cups milk, divided
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1 (9-inch) unbaked pie shell
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1 cup all-purpose flour
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1 teaspoon baking powder
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1/8 teaspoon salt
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1 egg
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1/8 cup unsalted butter, softened
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1 teaspoon vanilla extract