A popular snack is getting pulled off the shelves for possible contamination of listeria.

General Mills is recalling four varieties of its Nature Valley Protein Chewy Bars and Nature Valley Simple Nut Bars. The voluntary recall is part of an ongoing concern by a sunflower kernel supplier that recently recalled its products. Authorities are asking consumers to dispose of the products affected regardless of when they were purchased. The flavors to look out for are honey, peanut and almond with pumpkin seeds, peanut, almond and dark chocolate, roasted peanut and honey, and almond, cashew and sea salt.