Antonio Conte made nine changes from the side that drew 0-0 with Arsenal on Sunday but a strong and vastly experienced line-up proved way too strong for their Championship opponents.
Michy Batshuayi led the line and scored a hat-trick as Chelsea provided a glimpse of the future with a 5-1 Carabao Cup rout of Nottingham Forest on Wednesday night.
Kenedy and the impressive Charly Musonda were also on target and Tendayi Darikwa scored a late consolation for Forest as the Premier League champions advanced to the fourth round with ease.
Eden Hazard also earned his first start of the season after his broken ankle. He looked sharp in attack while Cesc Fabregas and Tiemoue Bakayoko dominated the midfield, with the former having a hand in all three goals before the break..
Chelsea also finished the game with three teenage British substitutes on the pitch – Welsh defender Ethan Ampadu, 17, Jake Clarke-Salter, 19, and England Under-19 international Dujon Sterling..