This could be dangerous for those who have an intolerance to egg.
The product is sold by retailers including Tesco, Waitrose and Ocado.
The stores have been given point-of-sale notices to be displayed with more information.
Shoppers should beware of products that are 100 grams with the best before date of April 30, 2021.
No other batches of the Melba Thins are known to be affected.