INGREDIENTS
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4 tablespoons unsalted butter, plus more for the pans
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3/4 cup all-purpose flour
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1 teaspoon baking powder
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1/4 teaspoon baking soda
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1/4 teaspoon salt
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3/4 cup Dutch-process cocoa powder
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1/2 cup packed light brown sugar
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1/2 cup granulated sugar
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1/2 cup brewed coffee (not espresso)
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1/2 cup buttermilk
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1 large egg
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1 teaspoon vanilla extract
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3 pints ice cream (any flavor)