Once the dough has doubled, take it out of the bowl. It will deflate a little bit and that is okay, challah is a strong bread. Cut it into six equal sections. Roll the sections out into long flat rectangles. Roll the rectangles lengthwise like taquitos.
Preheat your oven to 375 degrees.
Baste the loaves with the leftover egg-white to get a shiny, crunchy crust (optional).
Put the loaves in the oven for 12 minutes, then turn them around and bake them for another 12 minutes.