INGREDIENTS
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(1 stick) unsalted butter, room temperature, plus more for pan
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2 CUPS all-purpose flour, plus more for pan
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6 OZ. bittersweet chocolate, chopped
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1 CUP brewed coffee
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2/3 CUP unsweetened cocoa powder (not Dutch process), plus more for dusting
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3 large eggs, room temperature
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1 CUP buttermilk, room temperature
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2 TSP vanilla extract
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1-3/4 TSPkosher salt
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1-1/2 baking powder
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1-1/2 baking soda
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2-1/2 CUPS (packed) light brown sugar
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1/4 CUP vegetable oil
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3/4 CUP chilled heavy cream
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Granulated sugar