She was their hamburger helper.

The prison worker charged with helping two inmates break out of an upstate slammer cooked up an ingenious plan to smuggle them tools inside frozen chunks of hamburger meat, law-enforcement sources told The Post on Monday.

Joyce Mitchell allegedly provided the gear to convicted killers David Sweat and Richard Matt, who remained on the run 17 days after disappearing from the maximum-security Clinton Correctional Facility on June 6.

Meanwhile, DNA testing has tied the fugitives to a pair of grungy, prison-issued boxer shorts and other items found in a hunting cabin in Mountain View, N.Y., about 20 miles west of the lock-up, sources said.

A man who was checking on the place reportedly saw a stranger run away when he approached on Saturday.

The cabin is owned by a group of correction officers, according to a tweet from the editor of the Plattsburgh Press-Republican.

In addition to the underwear, the paper said cops found boots, bloody socks and the fingerprints of at least one fugitive in the cabin.

State Police Major Chuck Guess told an afternoon news conference that authorities had recovered and tested “specific evidence.”

He refused to elaborate, but said: “This is a confirmed lead for us. It’s generated a massive law-enforcement response, as you see, and we’re going to run it to ground.”