The former Olympiakos striker netted his third goal in his past five Premier League outings when he strode past Scott Parker and Steven Caulker before slotting home in the 53rd minute to give side a 2-1 lead at White Hart Lane.
Manager Moyes was happy with the way Mirallas performed in the second half but felt the 25-year old had much more to give.
"It was a terrific individual goal again," he said.
"I thought he got better. I was disappointed with him in the first half as I thought we needed more from him going forward and also at times when we didn't have the ball I needed him to help us a bit more.
"But that's why you have those players. Those players are the ones who can waltz past a couple of people and get you a goal."