More than 50 middle school students in Oregon were fed pretzels that were seasoned with crushed oven cleaner last fall, according to a newly filed lawsuit.

About 37 pretzels coated with Alto-Cham concentrated oven cleaner — an industrial-strength caustic chemical made with sodium hydroxide — were served during sixth-grade lunch at Fowler Middle School in Tigard, a suburb of Portland, on October 20, 2025, according to a nearly $1 million lawsuit filed last month.

More than 50 students ate all or part of the impacted pretzels, according to Tigard-Tualatin School District records obtained by Fox 12.

The school district said the tainted pretzels were the result of “human error,” and that a kitchen worker thought the chemical cleaner was salt.…