The Blues bounced back from their poor run of form and easily avoided a huge FA Cup shock in Sunday’s third-round tie.
Frank Lampard’s side went into the contest at Stamford Bridge on the back of just one win in their last seven matches across all competitions amid speculation over the manager’s future.
Defeat to fourth-tier Morecambe would have been potentially devastating for Lampard, but it was never a possibility after birthday boy Mason Mount’s excellent early strike.
Things got better and better for dominant Chelsea as Timo Werner ended his long goal drought before half-time and Callum Hudson-Odoi then netted shortly after the interval.
Kai Havertz - another player who has struggled to settle this season - wrapped up a straightforward victory with a late header on a morale-boosting day for Lampard and co.
Follow all the reaction with James Robson at Stamford Bridge and relive the match as it happened with Standard Sport’s LIVE blog.
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Full-time scores
Here are the rest of this afternoon’s full-time scores in the FA Cup:
Crawley 3-0 Leeds
Bristol City 2-1 Portsmouth
Cheltenham 1-1 Mansfield (into extra-time)
Manchester City 3-0 Birmingham
Barnsley 2-0 Tranmere
Crawley’s social media team having a bit of fun after the full-time whistle - and who can blame them!
Crawley oust Leeds in upset
What a win for League Two Crawley!
They have beaten Premier League side Leeds 3-0 to advance through to round four.
A certain Mark Wright also came on for his debut in stoppage time at the Broadfield Stadium.
Full-time
Chelsea 4-0 Morecambe
The Blues safely into the hat for round four.
90 mins: Just the two minutes of added time for Morecambe to endure.
88 mins: Another sight of goal for Giroud, who looks very eager to add his name to the scoresheet.
Lampard will be pleased to see his side still going for the jugular here.
GOAL! Chelsea 4-0 Morecambe | Kai Havertz 86’
86 mins: Havertz and Werner both on the scoresheet!
Abraham combines with Azpilicueta, whose powerful cross from the right is headed in by Havertz.
This has been a very pleasing afternoon indeed for Lampard and Chelsea.
84 mins: Pulisic feeds Giroud, whose low shot is seemingly blocked behind for a corner, but a goal kick is awarded.
James Robson at Stamford Bridge
This feels like a really valuable afternoon for Chelsea. They are flowing in a way we just haven’t seen for a good while now.
A goal for Werner, Havertz growing in confidence and another exceptional performance from Ziyech.
80 mins: Two more changes from Lampard with only 10 minutes to go and a place in the fourth round long since secured.
Fikayo Tomori and Tino Anjorin replace Zouma and Hudson-Odoi.