De Bruyne opened the scoring in the 17th minute, Foden scored twice before half-time and Julian Alvarez added the fourth in the second half as City climbed to within a point of Arsenal with a game in hand.
Foden has 24 goals for City in all competitions this season and has often been utilised in more central roles by coach Pep Guardiola, especially when top scorer Erling Haaland is absent.
"Now Phil gets trusted to play centrally. Even today we didn't play with any wingers, so we both played a little centrally and had to go on the wings sometimes," said De Bruyne.
"He was always a number 10 and it's hard to understand everything you need to do in a Pep team.
"It's more the structure of it and on the wing you get more freedom. Phil does what he does for six, seven years. He's been doing this for years and helped us win titles. This season he's gone up a level."
Foden, 23, said the central role suited him.
"I've always said I see myself centrally," he added. "This year I've moved more inside and helped my game. It's where I want to be to create and score."
City next travel to face Nottingham Forest on Sunday.
