Goals from Michael Essien, a brace from Didier Drogba and strikes by Joe Cole, Salomon Kalou and Andriy Shevchenko humilated so-called high-flyers City.
First team coach/manager Avram Grant refused to smile at the post match press conference, but did say how he enjoyed the game.
He said:" We are in the middle of where we want to be in terms of achivement.
"Today was a major step towards that.
"The players had a great attitude.We are concentrating on attacking football and how to make us even better.
"It's important to win with style.
"We can't do for all the 90 minutes. But it's a philosophy I have followed all my life.
"My job is to make my team and the fans feel good.
Talking about the omission of Shaun Wright-Phiilips and Florent Malouda, Grant said: "I can only play 11 men and have five subs.
We have a squad of 25 so some can't be involved.
"I speak to the players but what we say is private.
"Their job is to do what's good for Chelsea.
"Frank Lampard plays even better than the game before. He has made a fantastic contribution [to the team] he is a very clever player.
"It was also a fantastic goal from Sheva. He is showing a great attitude. It's not easy for a big star to be on the bench
So while Aril is happy, the same cannot be said of City boss Sven-Goran Eriksson, who was on the receiving end of the worst defeat in his long career.
"I am very disappointed," said the Swede.
"My worst defeat was when I was with Gotenberg and we lost 5-1 to Arsenal in the Cup winners' cup.
"If you don't defend, things happen. If you give Chelsea players time and space, they will kill us.
"Chelsea are a fantastic side, but we made them even better today.
"I am not alone in being disappointed, the players are too.
"Hopfully it is only going to happen once - it's a wake-up call for all of us.
"I cannot blame Joe Hart (goalkeeper) for the defeat. We have to be more agressive and different. Today all of us found it difficult.
When asked about Avram Grant, Eriksson said: "I did not want Grant to do well today. I never saw him play but I have heard good things about him.
"But we were awful at defending. I'm glad we have another game quickly on Wednesdsay to try and put things right."