The Northern Ireland ace, who is out of contract in the summer, took the spotlight with his double which included a spectacular first-half volley.
McInnes admitted he is refusing to give up hope his star man will sign a new deal, despite stalling over his future.
The Dons boss said: “We have spoken to Niall and his agent. We are respectful he has a lot to consider. The good thing for us is he has never indicated he wants to leave.
“He’s just wants to take his time because it’s a big decision.
“His love for the club is undeniable and he knows how we feel about him. We’d love for him to hang around a little longer.
“Niall’s a happy boy at the minute. We gave him two weeks off and he’s come back with four goals.
“His first was different class. His touch was superb to pluck it out of the air and it was a fantastic piece of skill to connect with it so cleanly.
“Niall has scored some brilliant goals for us over the years, but that was right up there.
McInnes was thrilled as his team moved into second spot in the Premiership after making it five successive wins.
Skipper Ryan Jack grabbed the opener before McGinn’s duo and there was a late debut for new loan signing Ryan Christie, from Celtic, on a comfortable night against the deflated Dens Park outfit.
McInnes is looking to add one more signing before the transfer window closes on Tuesday – but it won’t be James Maddison.
The Norwich City playmaker told Canaries boss Alex Neil he’d rather stay and fight for his place at Carrow Road.
McInnes said: “James had indicated to him that, although there are players ahead of him, he feels there might be an opportunity to play some football at Norwich. We respect that.
“Thing can change quickly. We were hopeful James would be back, but it is one of those things. We wish him well.
“We brought Ryan Christie in and we’ll work hard to maybe bring one more in.”