What is Peanut Brittle if not a straight-up, stone-cold, iconically classic candy? Trader Joe’s Peanut Brittle is made for us by a celebrated English confectioner, who uses a first-rate recipe that includes creamy butter, sugar, roasted peanuts, and baking soda to produce a crunchy, sweet, and every-so-slightly salty Peanut Brittle par excellence.