It takes the former Scotland international's tally to 19 for the season and his outstanding form has led to many labelling him as the overwhelming favourite to be named player of the year. And Commons, who also grabbed a double in his side's last run out against St Mirren, admits he is in the kind of form that players dream of.
"The ball is dropping very nicely for me and it's the sort of form you dream to be in but very rarely do you keep scoring," the Celtic player said. "When I first came here I scored quite a few goals. Attacking-wise we had Gary Hooper, Georgios Samaras and Anthony Stokes and we were all scoring good goals. But I've not been in this type of form apart from that spell when I first came through the door."
Commons added: "I'm not grabbing world class goals I just seem to be in the right place at the right time. We've got fast wingers and obviously when James Forrest and Emilio Izaguirre get down the wings I do my best to get in the box and get the tap in and scruffy goals."
His manager Neil Lennon admitted after the match that he was running out of superlatives for Commons. "It's another two goals and he's up to 19 now and for a guy who's not a natural centre forward it's a wonderful contribution to the season," the Celtic boss said.
"He's a consummate professional. He's playing very, very well at the moment and I think he's really enjoying his football.He's really instrumental in the way we want to play and I think it would be difficult to name other players as candidates for player of the year."
Motherwell had come into the match against Celtic looking to make it seven wins in a row - a feat they hadn't achieved since 1933 in the top flight. However, it only took until the fifth minute for Celtic to grab the lead with a goal created and finished by Commons.
Both sides had chances before Anthony Stokes earned Celtic a 39th minute penalty which Commons despatched for his 19th of the season before former Celtic captain Stephen McManus turned the ball past his own keeper in the 68th minute to make it 3-0.
The win means Celtic move 13 points clear of Aberdeen with two games in hand as they extended their unbeaten start to the season to 21 matches as the Hoops defence kept their eighth clean sheet in a row in the league for the first time since 1986.
When quizzed on his side's impressive run of results the Celtic manager admitted the unbeaten start to the season mattered more to him than the shut out record. "I think that shows consistency although I have to say my goalkeeper made a brilliant save at 2-0 up and his concentration levels are brilliant," Lennon said. "He's the main reason we have kept the clean sheet record going but to be 21 games unbeaten is something the players can be proud of."
The only disappointment for Celtic came ten minutes from time when Stokes was shown a straight red for a tackle from behind on Keith Lasley. "I can understand the referee giving the red card but I felt it was harsh myself. I think Anthony's made a genuine attempt to get the ball and he was late," said Lennon.