Save the addition of salt, spices and other add-ins for taste, butter is a single-ingredient food. So, it may come as a surprise that on October 11, the FDA recalled 80,000 pounds of Costco brand butter for containing its only ingredient: milk.

Costco was forced to recall nearly 80,000 pounds of Kirkland Signature butter because of an "undeclared allergen." It forgot to list "milk" on the label.

Costco’s bakery is one of the most popular departments in the store. The store’s butter croissants are a fan favorite, too, but a notice sent to Costco members who purchased them recently indicates that they’ve been recalled.