Caroline Weir, Nikita Parris and Claire Emslie were also on the scoresheet, as Nick Cushing's side stormed to an emphatic victory.
Stanway opened the scoring a pinpoint drilled effort before Weir doubled the lead, slotting home Nikita Parris' cross.
Stanway completed her hat-trick with two low drives from distance - her second City treble.
Parris made it five with a header and claimed another assist, beating Marie Hourihan to the ball and teeing up Emslie to smash into the back of the net.
Relive the memorable win by watching the highlights above...
City return to domestic action with a mouth-watering Women’s FA Cup semi-final clash against Chelsea on Sunday 31 October.
It’s a 12:45pm kick-off at the Academy Stadium and tickets for all home games are now on sale