Lampard, whose side came into the game on the back of a poor run, fielded a strong team against the minnows from Lancashire in an attempt to boost the Blues’ confidence.
The hosts dominated the game as expected and took the lead inside the opening 18 minutes through midfielder Mason Mount, who was celebrating his 22nd birthday.
Timo Werner ended his 13-game goal drought on the cusp of halftime after tapping home a header from Kai Havertz.
Chelsea started the second half in similar fashion as Callum Hudson-Odoi met a trademark cross from Hakim Ziyech to score the third goal of the game four minutes after the interval.
Havertz stopped a run of 15 games without a goal when he rose highest to head home a cross from Cesar Azpliicueta five minutes before the final whistle.
Despite a comprehensive victory at Stamford Bridge, Lampard insists his team lack the killer instinct.
"What we can’t ask the youth of this squad sometimes is to be absolutely consistent and be killers, like other players in the league are in terms of the numbers they produce and consistently produce," Lampard said in his press conference at Stamford Bridge,” he said.
"That will come for our lads but at the moment their contributions are good.
"I mean killers in the best possible terms and I hope people know what I mean. We have a lot of young players with a lot of potential, who are coming through and of a young age.
"However the players at the top of the Premier League are scoring week on week and winning year on year, and at the ages of 27, 28, and are very established and they produce week on week, with big numbers. Players at that stage expect to be producing at those sorts of levels.
"So, for us, there's work to be done to get to the levels where hopefully we can jump to challenge those teams."
