They’re “Double-Double” trouble.

Two female hamburglars passed dozens of bogus $100 bills to buy eats at more than 20 In-N-Out locations in California, cops said Monday.

Auriona Lewis, 24, and Tatiyanna Foster, 26, both of Long Beach, were separately in and out of a total of 21 of the burger joints in the ketchup caper — ordering just fries or “The Flying Dutchman,” an off-the-menu favorite featuring two patties and cheese, Glendale Police told The Post.

“They were ordering the smallest stuff so they could get the most cash from the change.” said Glendale Sgt. Gaik Pobokhian.

Surveillance tape obtained by The Post shows one of the suspects at the beloved California chain — known for such greasy goodies as its “Double-Double” two-patty burger — in pink pants and passing a counterfeit bill to buy fries. 

The scheme began unraveling Oct. 21 when an eagle-eyed worker at a Glendale In-N-Out called the cops to report that a fake c-note had been passed.

The detective made some phone calls and discovered it was happening all over LA County. After looking through surveillance tape, officers were able to identify Lewis by her license plate, police said.

Foster was later identified and arrested and taken into custody Dec. 15.

Pobokhian said the total loss appears to involve a “few thousand” dollars.

Pictures of the fake bills provided to The Post show that all the bills have the same serial numbers.

Lewis has been charged with felony grand theft and counterfeiting, which carries one to three years in prison. When she was caught, she was in possession of counterfeit bills matching those used in the Oct. 21 incident, cops said. She is currently out on bail.

The charges against Foster remain pending until a court appearance later this month.