Osman scored his fifth career goal against Villa, his best haul against any one club.
But the 30-year-old praised Tim Cahill's contribution as the Australian showed excellent presence of mind to lay on his first half opener.
"The ball went over my head, Tim touched it on and I tried to hit the first one but I think I just kicked a chunk out of his leg," explained Osman on evertontv.
"He ran off into the corner and managed to cut it back to me and I was able to place it in the corner.
"I was delighted with the goal and it was good play from Tim."