Preheat oven to 375 degrees F.
Grease a 13 by 18 by 1-inch sheet pan.
Line pan with parchment paper and grease /flour the parchment.
In a bowl, sift the flour, baking powder, baking soda, cinnamon and salt.
In a mixer, whisk eggs and sugar on medium for 3 minutes.
On low, add the pumpkin.
Add flour mix.
Spread into the pan.
Bake 12 minutes or until top springs back when lightly pressed.
Lay out a very thin cotton dish towel and pour 1/4 cup confectioners' sugar all over it.
Loosen the cake and flip it onto the towel.
Remove parchment paper.
Roll the warm cake and the towel together .
Cool on a rack.