Raheem Sterling made a lively start to the game on the left-wing for the visitors, firing just wide inside the first minute before having a goal disallowed for offside.
But Brenden Aaronson pounced on a terrible error from Chelsea goalkeeper Edouard Mendy to open the scoring in the 33rd minute.
Four minutes later, Rodrigo Moreno headed his fourth Premier League goal of the season from Jack Harrison's free-kick after Sterling fouled Marc Roca.
Roles were reversed midway through the second half when Harrison converted Rodrigo's knockdown from close range.
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This could get embarrassing for Chelsea. Harrison and Rodrigo pull them apart again but Mendy rushes out to make a save this time.
That surely settles it and it's a rich reward for Harrison's brilliant showing. James chips one into the box from the left,