I googled Povitiza Povitica a bit more, as it didn't sound Austrian to me... and although I knew there were many Serbian immigrants to Butte, I didn't know that Austrians were another significant immigrant population in the past. Povitica comes up more as a Serbian, Croatian or Polish bread, but also Austrian.

Here are the immigrants to Butte in its glory mining days, according to wikipedia.
"The city attracted workers from Ireland, Wales, England, Lebanon, Canada, Finland, Austria, Serbia, Italy, China, Syria, Croatia, Montenegro, Mexico, and all areas of the USA. The legacy of the immigrants lives on in the form of the Cornish pasty which was popularized by mine workers who needed something easy to eat in the mines, the povitica -- a nutroll which is a holiday favorite sold in many supermarkets and bakeries in the Butte area -- and the boneless pork-chop sandwich."