Here is why Costco recalled almost 80,000 pounds of butter

Costco recalled nearly 80,000 pounds of store-brand butter last month because the product's label was missing a key ingredient: milk. 

The wholesaler recalled 79,200 pounds of two varieties of butter — 46,800 pounds of its Kirkland Signature Unsalted Sweet Cream Butter, and 32,400 pounds of Kirkland Signature Salted Sweet Cream Butter because it omitted the allergen. 

The Food and Drug Administration Butter said both products list cream, "but may be missing the Contains Milk statement."