INGREDIENTS
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1/2 cup unsalted butter
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3/4 cup granulated sugar
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1/2 cup light brown sugar
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1 tsp vanilla extract
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2 eggs
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3/4 cup unsweetened cocoa powder
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1/4 tsp baking powder
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1/2 cup all-purpose flour
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1/2 cup unsalted butter, softened
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3 tbs corn syrup
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1/2 cup unsweetened cocoa powder
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1 tsp vanilla extract
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1 1/2 cup confectioner's sugar
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3 tbs hald and half (or milk)