Sourdough with cheese, potatoes, onions and herbs?

Toast

I'm really starting to get the hang of sourdough and wanted to try something new.  There is a bakery in Northern California called Wild Flour Bakery that makes an incredible sourdough (everything they make is great) that changes every week and has a combination of herbs, large chunks of cheese, large chunks of potatoes, onions, etc. in it. 

 

I want to try to reproduce it.  I'm not sure when to add this stuff to the dough and if there is anything different I need to do?

Dave is right. Danni's loaves are loaded with goodies and are consistency amazing. And yes, I bake cheese and herb bread often. Yet Ian bakes a lot of potato, onion and cheese bread! Many times he includes all three in one bake.