Foden has 24 goals for City in all competitions this season and has often been utilised in more central roles by coach Pep Guardiola
The emphatic scoreline did not look likely in the first half as the hosts shaded it, but Chelsea took complete control after the break to send out an ominous warning in the title race.
Thiago's header gave Chelsea the lead in the 49th minute and when substitute Kante's deflected shot crept past Spurs keeper Hugo Lloris shortly after there was no way back for the hosts.
Rudiger's late strike was enough to give Chelsea an identical record to Liverpool with the two sides on 13 points from five games, both having scored 12 goals and conceded one.