The 25-year old striker opened the scoring in the 31st minute, powering the ball past goalkeeper Vito Mannone after two Sunderland defenders collided.
He added a brace in the space of two minutes early in the second half before Ashley Barnes completed the rout with a 67th-minute penalty.
Jermain Defoe pulled one back for Sunderland after a fine solo run by Adnan Januzaj, but it was scant consolation for the Black Cats, who remain in the relegation zone in 18th place with 14 points from 19 games.
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(Writing by Zoran Milosavljevic; Editing by Hugh Lawson)
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