The Blues moved back above Manchester United and into the top four with an emphatic victory over the Hornets.
Lampard’s men drew first blood on the 28th minute mark when Olivier Giroud turned smartly to sweep home Ross Barkley's pass.
The hosts' advantage was doubled by Willian from the penalty spot on the cusp of halftime before Barkley delivered the coup de grace during the dying embers of the game.
In an interview with Sky Sports after the game, Lampard was quick to praise his team’s effort against a defensive side.
“Clean sheet at home and three goals. we played some nice stuff,” the English coach said.
“It's difficult against the low block sometimes and the way we broke it down was good.”
"We could have been better in the second half with our passes but we defended the set-pieces really well. It was a comfortable evening for us.”
"When you have two players in those advanced midfield positions against Watford, you have to get players behind their midfield.”
"Mason Mount's pass is wrapped through the front line [in build-up to first goal].”
“I like working with that position because it's where I played and it's important we have quality in that area to unlock the door."