After the break, Haaland doubled the lead from the penalty spot, calmly sending Jose Sa the wrong way after Ruben Neves brought down Ilkay Gundogan inside the box.
Minutes later, the striker completed his fourth treble of the season, stroking into an empty net after Riyad Mahrez capitalised on a defensive error from the visitors.
Mahrez was denied a wonderful fourth, as his dinked finish was ruled out for a marginal offside.
We remained cool, calm and professional to claim all three points!
View the best images from the victory via our gallery below.