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Boro kept up with the relentless pace at the top of the Championship table with a comfortable 3-1 win over Charlton.
They survived a little jitter at the end of the first half to play with real swagger and style after the break and cruise to victory on a day when all the top four won.
Patrick Bamford struck an early opener and Boro dominated the first half before Charlton levelled out of the blue with a Gudmundsson thunderbolt to set up a nervous spell.
But Boro were bright after the break and Jelle Vossen quickly restored the lead then Lee Tomlin wrapped it up late on to cap a fine individual display by the Championship player of the month.
Boro fielded the same team that ground out a 1-0 win at Brentford last week,. It was only the first time in 44 games going back to last March the team was unchanged and for only the second time in 112 games and over two years.
Boro had some early probes before Charlton broke out to cause a scare in the third minute as Church flicked on for Watt to chase into the box but Ben Gibson arrived with a risky but well executed sliding tackle then Buyens drilled the loose ball wide.
Boro were quickly back on the attack as first a weaving run by Albert Adomah was blocked by Ben Haim then a cross in from the right by Ryan Frederick was glanced on by a diving Patrick Bamford header only to be scrambled behind at the far post.
That won a corner that led to Boro's opener on five minutes as Grant Leadbitter curled to the near post and PATRICK BAMFORD powered home a downward header.
And Boro went close again on 10 minutes as Leadbitter sailed another corner into the middle and George Friend headed just over from eight yards out.
And on 13 minutes Boro almost had a second as Bamford won a loose ball 25 yards out and touched it inside for Leadbitter to deftly lift it over a challenge then wriggle inside another to find space on the edge of the box but then his low shot was deflected behind by an alert defender and the corner scrambled away.
Boro threatened again on 18 minutes as a neat Lee Tomlin back-heel sparked a crisp exchange down the left and when the ball came back to the newly named Championship player of the month he flicked superbly into the box onto Bamford's perceptive run but his shot brought a good full length save from keeper Dmitrovic.
Then the keeper was tested again on 26 minutes as Jelle Vossen controlled a Leadbitter touch and drilled in a shot that came back of the chest of Dmitrovic.
Straight up the other end Charlton broke quickly in numbers and Gudmundsson rifled in a shot that rattled the post but the whistle had already gone for a foul in the build-up then the midfielder sent the free-kick dipping just over.
There was a hold-up as former Boro loanee Milos Veljkovic went down with what looked like a serious shoulder injury after tangling with Tomlin. He limped off on 34 minutes with Johnny Jackson coming on.
But Charlton levelled out of the blue on 37 minutes as Buyens broke down the left and tricked past sluggish Kenneth Omeruo and then squared for JOHAN GUDMUNDSSON to hammer in a 22 yard rocket into the near top corner.
Boro were quickly back on the attack as a Fredericks cross forced the keeper out to collect, then Solley bravely dived in to block a Tomlin shot and soon after the defender came sliding in to block an Adomah shot on the edge of the box.
And in stoppage time a ball into the box wasn't cleared and Vossen drilled in a low shot on the turn that was deflected behind off Ben Haim for a corner.
HALF-TIME: BORO 1 CHARLTON 1
But Boro came out looking fired up after the break and after pinning Charlton down in their own box regained the lead on 48 minutes.
Tomlin collected on the edge of the box pushed a ball wide to the right for Fredericks to drill in a shot that was blocked.
Then Tomlin reacted quickly to pick up the rebound and barge through a challenge before his shot rebounded nicely for JELLE VOSSEN to sweep home form eight yards out.
Charlton responded with a good spell and won a corner on 52 minutes and when it was only half-cleared Gudmundsson drilled a low shot through the crowd that was charged down by Friend.
Straight up the other end Boro threatened again as Bamford cut in from the right to fire in an angled effort that looped up high off a defender and as it dropped Adomah tried an overhead kick but it screwed straight into the keeper's arms.
On 57 minutes Boro went close again as a corner was only half-scrambled away and when Tomlin laid it off Adam Clayton rammed a low 12 yard shot through the crowd that was deflected straight to the relieved keeper.
On 58 minutes Charlton put on Vetokele for Church.
Boro went close again on 62 minutes as a neat touch on by Tomlin sent Bamford into the box and past a defender but as he tried to control he was sent sprawling by a tackle but the hopeful cries from the crowd for a penalty were waved away.
Boro had to defend for a spell as Charlton tried to claw forward but they broke out to go close on 70 minutes with a delightful move.
Vossen touched on to Tomlin who did a drag-back and spun on the edge of the box to slot into the path of Vossen's overlap but the Belgian's shot was deflected behind.
On 72 minutes Boro put on Adam Forshaw for Bamford and Adam Reach for Adomah.
A long spell of swaggering possession was interrupted on 79 minutes as Charlton broke quickly and after Omeruo and Clayton mugged Vetokele the loose ball was whipped to the right where Gudmundsson put a speculative effort well wide.
On 82 minutes Forshaw was booked for a foul on Vetokele then from the free-kick Onyewu's header looped straight into the arms of Konstantopoulos.
On 85 minutes Charlton put on Lepoint for Buyens.
Boro went close as Leadbitter burst forward and barged through a tackle by Lepoint to get to the edge of the box then slotted it wide for Reach to square across the face of goal but it was turned behind for a corner.
And from the the flag-kick Boro sealed it with a third on 88 minutes as Clayton made a run to drag two defenders out of position before Leadbitter picked out LEE TOMLIN to crack in a rocket from 22 yards.
In the final minute Boro put on Kike for Vossen.
BORO: Dimi, Fredericks, Gibson, Omeruo, Friend, Leadbitter, Clayton, Adomah (Reach, 72), Tomlin, Vossen (Kike, 90), Bamford (Forshaw, 72) Subs: Mejias, Woodgate, Whitehead, Kalas.
CHARLTON: Dmitrović, Solly, Fox, Ben Haim, Onyewu; Gudmundsson, Veljković (Jackson 34), Buyens (Lepoint 85), Cousins; Watt, Church (Vetokele, 58). Subs: Etheridge, Wilson, Gomez, Bikey-Amougou, Lepoint.
Ref: Trevor Kettle (Rutland)
Att: 18,903 (240 away fans)
