Preheat oven to 350°F. Line ... Whisk together cocoa, sugar and boiling water. Cool to lukewarm. Prepare cake mix per package directions, using ... and chill 2 hours.
Preheat oven to 325 degrees. ... half of confectioners' sugar in 2 tablespoons at a ... confectioners' sugar, nuts, chocolate and cornstarch, vanilla. Mix constantly ... Cool completely. Loosen cake from pan, remove to plate. Frost with favorite frosting.