Chocolate Sponge Cake (or Chocolate Jelly-Roll Cake) Recipe Ingredients yields 1 1/2 sheet pan sponge cake 1/4 cup dutch processed cocoa powder 1/3 cup cake flour 1/4 t. salt 1 t. baking powder 1/2 t. instant coffee 4 eggs, yolks and whites in separate bowls 1/2 cup sugar