INGREDIENTS
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Cake:
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1 cup semisweet or bittersweet chocolate chips
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1/2 cup (8 tablespoons) unsalted butter
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3/4 cup granulated sugar
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1/4 teaspoon salt
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1 to 2 teaspoons espresso powder, optional
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1 teaspoon vanilla extract, optional
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3 large eggs
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1/2 cup unsweetened cocoa powder, Dutch-process cocoa preferred
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Glaze:
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1 cup semisweet or bittersweet chocolate chips
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1/2 cup heavy cream