Competing in the first of two events scheduled on the Salt Lake 2002 Olympic course in Deer Valley, Begg-Smith lifted his performance level once again, scoring 26.42 points from the judges, 0.64 ahead of silver medallist Guilbaut Colas of France on 25.48 points.
Dmitry Reiherd of Kazakhstan collected the bronze medal with 25.10 points.
Begg-Smith was in awesome form, collecting the highest turns score, the second best jump points and recording the second fastest time down the Utah course that put him out of last season's World Cup with a leg injury.
"Dale is really solid at the moment," said OWI team physiotherapist Peter Hogg.
"And he's doing a good job of maintaining his health in the process."
"As of right now, everything is going really well."
On the World Cup standings, Begg-Smith has now amassed 395 points from his five events, 69 points clear of his nearest rival, Swedish skier Jesper Bjoernlund, gold medallist in the opening two events of the season.
Defending World Cup champion Alexandre Bilodeau is in third place on 205 points, after finishing in 39th place.
Missing from the Deer Valley action was Australia's number two mogul skier Ramone Cooper, ruled out of the event and out of the Vancouver 2010 Games following a major knee injury sustained in training the previous day.
The Perisher Blue 21-year-old had started the season with a ninth placing, the second top ten of his career, and was looking forward to a strong performance at the Games.
"I was holding onto a glimmer of hope that it was not as bad as first thought," Cooper said.
"But the MRI results show a torn PCL (posterior cruciate ligament), partial MCL (medial collateral ligament) tear, a partial lateral meniscus tear, another tear on something I'm not sure of, and bone bruising."
"I'm extremely devastated."
Fellow AIS skier Sam Hall finished in 40th place on 19.68 points, while NSWIS athletes Matt Graham, David Graham and Hugh Norton filled 41st, 48th and 56th place respectively.
NSWIS female mogul skiers were also in the Deer Valley line-up, with Nicole Parks producing the best result, a 31st placing, one spot ahead of Sarah Melville.
Britteny Cox was in 34th position, Taylah O'Neill 38th and Roanna Humphries 41st.