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The versatile Arsenal man was a substitute in the Carabao Cup penalty shoot-out win against Liverpool at Anfield, again coming up with another incredibly laidback spot-kick.
It was the second time in less than a month we've seen Maitland-Niles opt for a ridiculously slow run-up before converting with ease from 12 yards against the Premier League champions.
The pressure was on but Maitland-Niles exuded nonchalance once again and was even seen laughing at goalkeeper Adrian after his ice-cold penalty sent him the wrong way.
He continues to do the business when it comes to penalties - even if he gives his manager a fright because of his approach.
"I told him in the dressing room that I'm going to have a heart attack because with his body language... Jesus Christ," Arteta said in his post-match press conference.
"He puts it in the net which is the reason why he was one of the subs."
As relaxed as the England international is, he does indeed put it in the net. He's beaten Adrian from the spot in last year's Carabao Cup shoot-out, while Alisson Becker was also no match for his calm penalties in the Community Shield at Wembley.
You only have to watch the following compilation, which includes a couple of pre-season efforts, to see how easy the 23-year-old makes it look.
After Mo Elneny was the first to miss, Divock Origi and Harry Wilson were both denied by Bernd Leno before Joe Willock just about put the crucial penalty away when the ball squirmed over the line to give the Gunners a 5-4 win in the shoot-out.
The triumph sets up a quarter final showdown with holders and Arteta's former employers Manchester City in December.