The condensed soup method of writing

Just read Kelly Klepfer's interview with novelist Connie May Fowler, whose most recent book How Clarissa Burden Learned to Fly was published by Central Grand Publishing in 2010, on Novel Journey. who revealed that she wrote this most recent novel first in a condensed 50-page version and then she expanded it. 

"I think fear prompted me to write How Clarissa Burden Learned to Fly in 50 pages," Fowler told Klepfer. " I feel if I can simply get it on the page, even in condensed form, I can then go it and turn it into a novel and not an abridged version."

I wonder how many other authors write this way.