The 32-year-old has been the form athlete in the women's cross country events in Italy, medalling in every race she had entered ahead of the 30km classic mass start finale.
That amounted to gold in the sprint, the pursuit and the 4x5km relay with her Norwegian teammates and silver in the 10km freestyle where she was pipped by Therese Johaug.
At the World Championships in Oslo two years ago in, Bjoergen was going for a fifth gold medal in the 30km classic finale only to be beaten by Johaug.
However history was not to repeat itself as Bjoergen executed the perfect race to overtake long-time leader Justyna Kowalczyk ahead of the home straight for victory.
Johaug was dropped on the final climb into the finish with Bjoergen's pace too much for Kowalczyk to match as she clocked a winning time of 1:27:19.9hours.
Kowalczyk took silver 3.7seconds behind while Johaug finished with bronze another five further back before a gap of almost a minute and a half from Heidi Weng in fourth.
It was clear from the off that Bjoergen, Kowalczyk and Johaug would be challenging for medals as they hit the front however they weren't alone there.
Germany's Nicole Fessel and Weng stuck with them for two thirds of the race before the pace became too great and they dropped off to leave them to it.
Kowalczyk did the majority of the work until the final metres when Bjoergen and Johaug attacked however the latter slipped on the final climb and dropped off.
That left Kowalczyk and Bjoergen going into the final straight with the Norwegian stalking her Polish rival and overtaking her well before the finishing line for victory.