Leicester, who maintained their three-point lead at the top of the table, had twice tested Liverpool keeper Simon Mignolet in the first half with the Belgian brilliantly tipping over a Shinji Okazaki header and a curling effort from Riyad Mahrez.
Yet the fireworks were reserved for shortly after the restart when Vardy latched on to a hopeful long ball forward and let fly from 25 metres to put Leicester ahead after 60 minutes.
He added to his tally and made the game safe 11 minutes later with a more opportunistic effort, lifting the ball into the net past Mignolet from five metres for his 18th league goal of the season.
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(Writing by Toby Davis in London; editing by Pritha Sarkar)
