Khem Birch was the only other member of the Runnin' Rebels in double figures with 11 points in what became their seventh straight victory.
Nevada-Las Vegas (10-1) suffered its only loss of the season to Oregon on Nov. 23.
The Rebels built a 21-point halftime lead and were not threatened in the second period. Bennett made 7-of-12 from the field and hit 4-of-4 from the foul line.
Northern Iowa (6-5) was paced by Marc Sonnen with 15 points.