The Iceland international netted either side of the interval as Rangers extended their advantage at the summit to five points.
If Helguson was impressive, it paled in comparison to Adel Taarabt, who was at his irresistible best.
The dynamic midfielder was at his brilliant best as he terrorised Boro's backline, capping his performance with a goal from the penalty spot which wrapped things up.
The Hoops got the reward their endeavour deserved in the 41st minute through Helguson, who made no mistake from 12 yards and then he headed home his second.
Rangers found themselves three-up in the 68th minute when, after being brought down by Merouane Zemmama, Taarabt netted from the spot.
Neil Warnock's side took there foot off the gas thereafter, but, with their defence looking impregnable, they easily saw the game out.
Source: PA
Source: PA