Thunderbird Peanut Butter Brownie Bars - 12 BarsThunderbird Peanut Butter Brownie bars are superfood energy snack bars made with only simple, real food ingredients including fruits, nuts, seeds and spices. Each 1. 7 oz bar delivers the rich, indulgent taste of peanut butter and brownie in a wholesome format. Made from real ingredients like dates, nuts, chia seeds, chocolate covered fruit and more, these bars work by combining naturally occurring sugars from fruits with protein and healthy fats from