The Germany international netted in the 39th minute, shortly after Olivier Giroud had opened the scoring after coming off the bench to replace the injury Tammy Abraham.
Meanwhile, Kepa Arrizabalaga was recalled to play in goal and quietened his doubters with a cleansheet.
But who were the standout performers?
✔️ GOOD PERFORMANCE
Timo Werner: 7.3
Shortly after receiving treatment for a burst lip, Werner came back onto the field a little bloodied by eager to make an impact. And he did. Seconds later, he beat Emil Krafth and sent in a skidding cross that was not handled by Karl Darlow. Olivier Giroud was on hand to knock home.
He may not have been credited with an assist, but he did get a Premier League goal that has been long awaited. It was an ugly one as he scooped the ball home from close range - but he won't mind.
Had an astonishing 11 touches in the box.
Kepa Arrizabalaga: 7.7
There was some controversy when Kepa was named in the starting XI by Thomas Tuchel, but the goalkeeper responded with a strong display.
After a quiet first half, he made a string of solid saves in the second, notably flicking away a Joe Willock header that may well have been destined for the corner of the goal.
⭐ STAR MAN
Mateo Kovavic: 8.8
In Tuchel's possession-based idea of the game, it is vital for Chelsea that he had Jorginho perform to a high standard. They certainly did in this encounter, touching the ball comfortably more than any other players on the field.
Kovacic distinguished himself with his passing, though. He completed well over 90% of his attempts, including more than 20 into the final third of the field.
Perhaps the only aspect of his game that let him down was his finishing. He shot over after good work from Callum Hudson-Odoi in the second half.