However, he has gathered just two podium results so far, most recently in St. Moritz, Switzerland, in March 2016.
He was also part of the Norwegian team that won bronze in the Olympic team event in Pyeongchang in 2018.
In the traditional last race before Christmas on the floodlit Canalone Miramonti course, Foss-Solevaag won time with a flawless run in the steep middle section, before carrying his speed through the finish.
Many of his rivals struggled on the relatively soft snow surface due to the mild temperatures in the Italian Alps.
Manuel Feller, who finished second in Monday’s race, trailed by 0.52 in fourth, and overall World Cup leader Alexis Pinturault shared fifth position with Daniel Yule, 0.78 behind.
Slalom World Cup champion Henrik Kristoffersen continued his rough start to the season and had 1.25 seconds to make up in the second run.
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