Incensed about the “messed up” cheeseburgers they purchased at a McDonald’s drive-thru window, two Tennessee men allegedly returned to the fast food joint and vandalized it, cops report.

The peeved patrons were apparently set off by the paucity of onions on their cheeseburgers.

According to a Murfreesboro Police Department report, Christopher Slate, 21, and Sean Mosey, 23 were collared in connection with Sunday’s early-morning attack on the McDonald’s. Each man was charged with felony reckless endangerment and vandalism.

Slate (left) and Mosey are pictured in the above mug shots.

In an interview with cops, Slate said that the duo was “upset with McDonald’s because their cheeseburgers had been messed up.” He then “advised that they went home and continued to drink beer and get worked up about the cheeseburgers.”

The men, Slate confessed, returned to McDonald’s and hurled a piece of concrete through the drive-thru window and tossed a brick through the eatery’s front window. An employee standing near the drive-thru window was struck by debris and suffered several lacerations on his left arm. The restaurant’s manager was struck in the leg by the concrete chunk.

Slate and Mosey were subsequently arrested when their getaway attempt was derailed after Mosey, running from the scene, tripped and fell. He landed in the street and was unable to get up. Mosey is also facing a public intoxication charge.

The alleged cheeseburger avengers, both free on bond, are due to appear July 11 in Rutherford County General Sessions Court.