INGREDIENTS
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1 cup unsalted butter, room temperature, plus more for pan
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1/2 cup Dutch-process cocoa powder, plus more for pan
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3 cups sugar
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5 eggs, plus 1 egg yolk
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2 3/4 cups all purpose flour
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3/4 teaspoon table salt
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1/2 teaspoon bakíng powder
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1 cup buttermílk
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2 teaspoons vanílla extract
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Glaze:
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4 ounces chopped semísweet chocolate
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3/4 cup heavy cream
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1 tablespoon corn syrup