Kamarai Swyer got the ball rolling on 19 minutes, Michael Jacobs curled in a second four minutes later and then Elliott List converted from the spot as Town got their EFL Trophy campaign up and running with three points. Here are our player ratings from Sixfields...
9. Kamarai Swyer
Finally made his full debut and this was a very encouraging start to his Cobblers career, even accounting for the opposition. He was quick and strong, his touch was excellent, and he took his goal very well, confidently sweeping into the bottom corner. Hopefully he can build on this and produce similar or better performances against stronger opposition... 8.5 Photo: Pete Norton
10. Elliott List
His goal was all his own work. Pounced on a loose defensive touch and then too quick for Curd. Confidently stuck away the penalty. The injury is a worry though. He looked pretty dejected after pulling up right at the end of the first half... 7.5 Photo: Pete Norton
11. Jack Vale
Had a couple of nearly moments, crowded out in the penalty box early on and then unable to finish off List's good work prior to the penalty. Clearly still working his way to full match sharpness and he'll benefit hugely from the hour he played here... 7 Photo: Pete Norton
12. Dean Campbell
The game was done by half-time and so the second half became something of a non-event. Late strike was well saved by the Chelsea goalkeeper... 6 Photo: Pete Norton