The striker poked City ahead after 12 minutes, before doubling our lead 11 minutes later, tapping into an empty net after good link up play with Phil Foden to claim his eighth league goal of the season.
Seven minutes before the interval, the Norwegian completed his treble with a header from three yards out.
Pep Guardiola‘s side remained on the front foot after the break and added another through Joao Cancelo, whose thunderous strike from outside the box crashed into the top corner.
Julian Alvarez added a fifth shortly after the hour mark, marking his first start for City with a composed finish after being put through by Riyad Mahrez.
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The Argentine powered in his second and City’s sixth of the evening shortly before full-time, blasting into the roof of the net with his left foot.
View the best images from the convincing victory at the Etihad Stadium via the gallery below.
