Cook chocolate and milk in double boiler until thick as custard; cool. Beat egg yolks until thick and lemon colored. Add sugar gradually. Add flour and baking powder which have been sifted together alternately with chocolate mixture. Fold in the well beaten egg whites. Add vanilla. Pour in pan lined with paper. Bake in 350 degree oven 45 to 50 minutes. Cool and cover with the following frosting.
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