Two Manhattan bank ATMs had $110,000 in counterfeit bills stocked yesterday, cops said.

The forgeries were easy to spot since the bills had printing on only one side, sources said.

Police want to question an employee at the company that services the two money machines, the sources said, adding that investigators suspect the real dough was swapped out.

The forgeries were discovered at around 12:30 p.m. when an alarm that recognizes counterfeit bills was triggered, cops said.

Both banks are Chase branches; one on West 57th Street, the other on Ninth Avenue.

Two customers received the fake bills and handed them over to bank employees.