"This silky buttercream frosting is made with rich dark chocolate. For a fun variation, try it with white chocolate or hazelnut paste instead...."
INGREDIENTS
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1 cup sugar
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3 large egg whites
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1/4 teaspoon salt
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1/2 teaspoon pure vanilla extract
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2 sticks plus 2 tablespoons unsalted butter (9 ounces), cut into tablespoons, at room temperature
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4 ounces extra-bittersweet chocolate, melted and cooled