INGREDIENTS
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1/2 cup (4 ounces) unsalted butter, cut into 8 tablespoons
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2 ounces unsweetened chocolate, chopped
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1/2 cup unsweetened cocoa powder
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1 1/4 cups granulated sugar
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1/4 teaspoon salt
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1 egg, room temperature
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1 teaspoon vanilla extract
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1/2 cup stout beer, such as Guinness
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1 cup all-purpose flour
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1/2 cup semisweet chocolate chips
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4 ounces semisweet chocolate, chopped
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2 tablespoons unsalted butter