Gallagher scored twice as Chelsea overturned a deficit to win 3-1 at Selhurst Park.
The match started in favour of Crystal Palace, with Jefferson Lerma scoring a stunning goal to give the Eagles the lead.
Lerma’s goal was his first for the club and put Palace ahead at halftime.
However, Chelsea quickly turned the game around after the break. Gallagher, who had not scored in the Premier League this season, equalized with a well-taken volley from a Malo Gusto cross.
The defining moment came in the final minutes of the match when Gallagher struck again, scoring his second goal to secure the win.
Enzo Fernandez added a late breakaway goal to seal the deal for Chelsea.
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