After finishing first in his quarter and semi-final, the Olympic champion maintained his winning streak in the final to see off the challenge of Austrian Thomas Harasser and Canadian Chris Del Bosco.
A World Cup win on his home course was one thing Chapuis hadn't ticked off in his illustrious career but in doing so on Saturday he has also moved up to third in the World Cup standings with 170 points.
Del Bosco's third-place finish ensures he remains on top with 260 points, while his compatriot Brady Leman is in second place on 180 points.
Sanna Luedi crashes out in Ski Cross
In the women's race it was Sweden's Anna Holmlund who stood on top of the podium after pipping France's Alizee Baron and Austria's Andrea Limbacher in the final.
Everyone was anticipating a showdown between Holmlund and Canada's Marielle Thompson but the latter did not finish her semi-final.
The win puts Holmlund on top of the World Cup standings with 280 points, while Thompson sits second on 195 points and Baron is third with 154 points.
Mahler wins dramatic final for maiden victory
Sandra Naeslund pips Courtney Hoffos in photo finish