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.

Last month, the U.S. Food and Drug Administration (FDA) recalled almost 80,000 pounds of Costco's popular store-brand butter due to a crucial labeling error. While the butter listed "cream" as an ingredient, the packaging lacked a critical allergen warning alerting consumers that butter contains milk.

Costco voluntarily recalled 79,200 pounds of two types of its store-brand butter over the past month because their labels may not have said the products contain milk.