Pre-heat the oven to 350 degrees.
Grease your 18X13 rimmed baking sheet with butter.
Line the sheet with parchment paper, pressing down and then removing and flipping over the parchment to face greased side up. Dust liberally with flour, turning the baking sheet over and gently banging out any excess flour and set aside. Pull another parchment piece a little bigger than the baking sheet and set aside with the prepared baking sheet.
In a medium-size bowl, whisk together flour, salt, and baking powder, ensuring there are no lumps and set aside.
In the bowl of a stand mixer, add eggs + whites and sugar. Mix on medium-high until pale in color and light and fluffy. This should take about 8-10 minutes. Make sure to keep an eye on the mixture to avoid overbeating. Once the egg mixture is fluffy and light, mix in the vanilla, orange extract, zest, and Chinese five-spice. In two parts, fold the dry mixture into the wet, folding just enough to ensure no lumps but without mixing all the air out.
Pour out onto prepared baking sheet using an offset spatula to smooth out and distribute.
Bake for about 8-10 minutes, once the center is no longer wiggly and the cake is pillowy but firm to the touch. While the cake is baking, clean out your mixer bowl to prepare for the frosting.
This next part is vital to getting that perfect roll without cracking your cake. It involves handling hot objects, so make sure your kitchen space is clear and to have an open surface to work on. Have prepared the clean piece of parchment, wire cooling rack, powdered sugar, sieve, and a paring knife.
Remove the cake from the oven, run the paring knife along the sides to ensure there is no sticking.
Dust the cake with Powdered sugar and place the clean piece of parchment on top. Place the wire rack against the parchment-covered cake and carefully but quickly flip the cake so that the wire rack is now the bottom and the baking sheet is the top.
Remove the baking sheet and parchment, dust with powdered sugar.
Slide the cake off the wire rack onto a flat counter space. While the cake is still hot, roll the long end up like a cinnamon roll, keeping the parchment rolled up in the cake to prevent the layers from sticking together. At this point, there should only be one piece of parchment on the bottom of the cake.
Cover with a kitchen towel and allow to cool completely. Letting the cake cooled rolled will prevent it from cracking when you frost and re-roll it later. You're essentially training it.