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

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.

Nearly 80,000 pounds of butter were recalled from Costco stores after the FDA discovered the packaging did not disclose that the butter contained milk.