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In a medium bow, combine flour, cocoa powder, cornstarch, baking soad, baking powder and salt.
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Mix well; set aside.
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In a separate bowl, using and electric mixer set on MEDIUM beat egg yolks and 1/4 cup sugar until fluffy.
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In a smaller bowl, using clean beaters, beat whites on high until foamy.
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Gradually add 1/2 cup sugar; beat til stiff but not dry.
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Fold 1/3 egg whites into egg yolk mixture.
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Alternately fold in remaining whites and flour mixture.
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Prepare a 15" x 10" jelly roll pan lined with wax paper and greased and floured beforehand.
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Poor batter in pan, smooth top.
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Bake in a preheated 350 degree oven until toothpick inserted in center comes out clean, about 15 minutes.
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Dust a clean tea cloth with remaining sugar.
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Turn cake out onto prepared cloth, remove wax paper and trim cake edges.
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Starting with a long side, tightly roll up cake with cloth.
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Transfer seamside down, to a wire rack to cool.
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Unroll cake; remove cloth.
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Spread cool whip and re-roll cake.
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Place seamside down on a plate and dust with confectionery sugar before serving.
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I add some chopped chocolate bits to the cool whip sometimes for a change.