I know Palmer has taken a few spot-kicks already this season but this one was on a different level, because of what was at stake against his former club, with basically the last kick of an absolutely classic Premier League game.
There was huge pressure on him, knowing it all came down to whether he scored or missed, and with millions watching around the world. Yet he still stepped up and delivered.
He is only 21 and had never taken a first-team penalty before he moved to Stamford Bridge in the summer but, if he was feeling at all nervous, you would never have known it from the way he stuck it away - Ederson had absolutely no chance.
It was a great story for Palmer personally, to put away an important penalty like that against the manager who decided to sell him, and he was not the only Chelsea player who played like they had a point to prove, for various reasons.
Raheem Sterling looked right on it as well, and kept running at his man for the whole game, wherever he was on the pitch. He was superb too.
For whatever reason, it appears Gareth Southgate does not believe Sterling is good enough to get in his England squad, but that performance was the perfect answer to anyone who doubts him.
From the off against City, their attitude was fantastic and it didn't change whatever happened, good or bad. While Mauricio Pochettino's side were behind three times, their heads never dropped and they got their reward in the end.
If you are going to go toe-to-toe with City like that then you have got to be at the top of your game - be totally committed and believe in what you are doing.