Preheat oven to 350°F.
Line a jelly roll (10×15”) pan with foil and spray with floured Pam .
Beat eggs on high a few mins.
Add sugar, water, vanilla.
Add cocoa, salt, and baking powder.
Add flour.
Spread evenly in pan and bake 10-15 mins.
Lay out a kitchen towel and sprinkle with the powd. sugar.
When cake is done flip it onto towel, remove foil and at short end roll it up into the towel.
Cool 1 hour.