On his 595th Chelsea appearance, Lampard headed in an Eden Hazard cross after 19 minutes to move within two of Bobby Tambling's club record of 202 goals.
The impressive Hazard netted a second after 50 minutes as Chelsea moved a point above Tottenham, with a game in-hand, in the race for a Champions League qualifying place.
"It is one of my best days," Lampard told the BBC.
"Obviously, winning the Champions League and championships are the best, but personally getting 200 goals for the club, I never thought I would touch that so I am pleased to get it.
"Everyone keeps talking about the goalscoring record, I would rather people kept quiet. The important thing is trying to score goals to win games.
"We are in good form and everyone is at it. There is a good feeling around the place and we need to carry it on until the end of the season."