A limited number of 13-ounce bags of Tostitos yellow corn tortilla chips were recalled by Frito-Lay in late March because of undeclared milk.

The recall has now been upgraded to Class I, meaning “there is a reasonable probability” that eating the chips could “cause serious adverse health consequences or death”

Frito-Lay issued a recall of some bags of Tostito's tortilla chips, saying the snack foods may have been contaminated with undeclared products.The recall applies to 13-ounce bags of the company's Tostitos Cantina Traditional Yellow Corn Tortilla Chips.