Jody Morris' side had been held 1-1 in the first leg but were in rampant form for the return
Chelsea started well and had already forced Manchester City goalkeeper Arijanet Muric into a save before taking the lead
Trevoh Chalobah opened the scoring after six minutes with a towering header from captain Mason Mount's corner
Chelsea centre-forward Ike Ugbo made it 2-0 after 24 minutes with an acrobatic finish from Dujon Sterling's cross for his 10th goal of the competition
The visitors did not test Chelsea keeper Jamie Cumming until just before half-time when he saved a dipping shot from Lukas Nmecha
The City striker brought his side back into the game early in the second half when he shot home after running on to a long ball behind the Chelsea defence
But Callum Hudson-Odoi made it 3-1 with a run and shot from distance and Sterling added a fourth Chelsea goal just after the hour, cutting in from the wing and shooting home after being played down the wing by Ugbo
Substitute Cole Dasilva rounded things off when he was first to a rebound to complete the scoring
Source : PA
Source: PA