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Instructions
Heat oven to 350 degrees F. Grease 2 9-inch square pans or 3 8-inch round pans.
Pour boiling water over chocolate, stirring until chocolate is melted; cool. Mix sugar and butter in large bowl until light and fluffy. Beat in egg yolk, one at a time. Beat in chocolate and vanilla on low speed.
Beat in flour, baking soda and salt alternately with buttermilk, beating after each addition until smooth. Fold in egg whites.
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