Nigerian striker Kelechi Iheanacho added a third in stoppage time of the first half to increase Leicester’s lead, the timing of that strike ending Spurs’ hopes of gaining anything from the contest.
The visitors offered little in attack after the break, with Harvey Barnes adding a fine fourth nine minutes from time, securing Leicester a third straight win in all competitions and 13th place in the table on 24 points from 22 games.
Spurs are fifth with 39 points from 23 games, one point off the Champions League places but two games more than fourth-placed Newcastle United in action from Eddie Howe’s side against Bournemouth later on Saturday done.
With Tottenham manager Antonio Conte back in the dugout after missing last Sunday’s trip to Manchester City following gallbladder surgery, the Italian will be delighted with his team’s debut.