INGREDIENTS
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4 tablespoons unsalted butter
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1 ounce bittersweet chocolate, chopped, plus 1 ounce broken into 4 equal pieces
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1/4 cup (1 3/4 ounces) sugar
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2 large eggs
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2 tablespoons unsweetened cocoa powder
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1 teaspoon vanilla extract
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1/4 teaspoon salt
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1/4 cup (1 1/4 ounces) all-purpose flour
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1/2 teaspoon baking powder