Potato Bread w/ Potato Starter?

Hi there everyone! I am new to the site and loving all the info. I have a question:

Does anyone know of a recipe for a good potato bread that uses a sourdough potato starter in it? 

There is a local coffee shop here in Idaho that sells a lovely potato bread that has a fairly thick, chewy crust and a wonderful chewy, open crumb with bits of the potato skin in it. It has a rich sourdough flavor as well. The list of ingredients on the bag lists, "potato starter". My recent attempts at this bread came out with a flakier crust (probably because I did not steam my oven and it wasn't hot enough) and a crumb that was too dense and crumbly. I used my (fairly new) sourdough starter for this and fresh potatoes. Any ideas on how to replicate this bread???

I am very new to artisan bread baking and am trying to learn everything I can to make this wonderful loaf for my father (who can't get enough) and myself he heh. My goal is to get good at making a few specialty artisan breads like baguettes, sourdough and hopefully this potato bread! I've been baking breads like Challah, ww sandwich bread, rolls, basic sourdough etc. for about 3 years and am just now getting into the *real* bread making stuff. It's fascinating and I can't wait to learn!

Any ideas or help would be appreciated! Thanks!