Federal regulators have upgraded a product recall of Lay's Classic Potato Chips to the highest risk level for a batch that may contain undeclared milk ingredients. Last month, Frito-Lay issued a recall warning that more than 6,

The FDA issued a product recall on Lay's Classic Potato Chips in two states. The recall was upgraded to the highest risk factor over undeclared milk.

Frito Lay issued the recall in December after it was found that there was a potential or undeclared allergen, specifically milk, in the chips.