The 28-year-old took victory for the first time since January 2010 at the opening round of the World Cup season last weekend, winning the dual moguls event ahead of Justine Dufour-Lapointe in Ruka.
But, rather than wait another three years to repeat the trick, McPhie claimed her second straight triumph just seven days later as she beat teammate Heidi Kloser in the dual moguls big final.
Dufour-Lapointe had to settle for third this time around, defeating Australian Britteny Cox in the small final, to lose ground on McPhie at the top of the moguls World Cup standings.
McPhie leads with 200 points with Canadian Dufour-Lapointe now 60 behind while Kloser, seventh last time out in Ruka, jumps up to third a further 24 adrift.
Meanwhile in the men's dual moguls Bryon Wilson claimed the win with Alexandre Bilodeau pulling level with Canadian teammate Mikael Kingsbury at the top of the moguls World Cup standings.
Wilson beat Bilodeau in the big final but a second straight second-place finish was enough for him to reel in Kingsbury who finished third ahead of another Canadian Philippe Marquis.
Reigning World Cup champion Kingsbury and Bilodeau are tied on 160 points after two of the 12 rounds with Wilson, much like Kloser, moving into third with the win 42 behind the Canadian duo.