McDonald's second of his brace was his 50th goal for the Hoops and he said: "It was very pleasing to get the win first and foremost and secondly to get on the scoresheet.
"And not just the goals - I was quite happy with my performance, which is number one for the team.
"Obviously, we got a talking to at half-time, and we all knew we were quite fortunate to go into the break at 1-1.
"We got a lift from that and in the second half we powered through. Our fitness told, we kept driving on and had belief and got the second goal.
"We didn't look like we were going to give it up and it was nice to put the game to bed, even though I probably should have done a bit earlier."
Aberdeen manager Jimmy Calderwood felt McDonald was the difference between the sides.
"Take nothing away from wee Scott, he's brilliant at it, but we got caught out a wee bit on our heels."