After an impressive display in Wednesday's relay it was clear that Gossner was in good form on home soil and she backed it up with a victory of time of 20:57.2 for her third World Cup success of the season.
The 22-year-old was a class apart, finishing 7.1 seconds clear of Belarus' Darya Domracheva in second and Finland's Kaisa Makarainen in third.
Berger, meanwhile, who had helped Norway to relay success earlier in the week, looked distinctly off the pace as she eventually came home way back in 12th place.
Two missed targets cost the Norwegian dearly on a course where the general standard of shooting was very high.
Despite a disappointing result, Berger remains well clear at the top of the World Cup standings with 514 points, 77 ahead of Gossner, with Andrea Henkel, who finished fourth, completing the podium.