Mooy played in a more advance number 10 role, where he was able to create more goal scoring opportunities - both for himself and his teammates.
The former Melbourne City midfielder managed a game-high 84 touches as well as 63 passes, five shots, two clear cut chances created and, of course, one goal.
The 26-year-old has been a star performer in the Championship this season, and made the most of his opportunity in a more advanced role in the 70th minute.
Mooy played a wonderful one-two with Nahki Wells before slotting the ball in at the near post to make it 2-0.
Wells himself was on the score-sheet just three minutes later to add to Elias Kachunga's opener in the 66th minute.
Huddersfield are now in third position on 74 points with a game in hand, 9 points short of second placed Brighton & Hove Albion, one point clear of fourth-placed Reading.
Elsewhere, Jackson Irvine played 90 minutes and made five interceptions as Burton Albion went down 1-0 away to top of the table Newcastle United.
In good news for Australia, Tom Rogic made his return from injury, coming on in the 62nd minute for Celtic in their 1-1 draw with Patrick Thistle who had Ryan Edwards in their starting line-up.
Mathew Leckie came off the bench in the 88th minute in Ingolstadt's vital 3-2 win over fellow relegation battlers Ausburg.
Brad Smith was an unused substitute in Bournemouth's 2-2 draw with Liverpool. Mitch Langerak was in goals as Stuttgart drew 1-1 with 1860 Munich.
Jason Davidson played 90 minutes in Groningen's 2-0 win over NEC, while Brad Jones didn't have too much to do in Feyenoord's 8-0 win over the Go Ahead Eagles. Alex Gersbach also played 90 minutes in Rosenborg's 3-0 win over Sandefjord.
