Preheat Oven to 375 degrees. Use cooking spray to coat a jelly roll pan, cover with wax or parchment paper, and spray again, then lightly flour.
In an electric mixer whip together eggs and sugars until thick and creamy, add pumpkin puree.
Add dry ingredients all at once, mix with paddle just until blended. Don't over mix.
Spread evenly in prepared pan. Sprinkle on pecans, if desired.
Bake for 12-16 minutes, or until cake is springy and cooked through.
While cake is baking, sprinkle a clean white kitchen towel with powdered sugar.
When cake is done, immediately flip it onto your kitchen towel, roll it up with the towel, and leave to cool on a wire rack.