By the end of this guide, you'll have a fully chilled slab of Atlantic Beach pie bars, sliced, topped, and ready to hand to a crowd, with nearly all the work done the day before. The Atlantic Beach pie bars recipe itself is pantry-simple: crushed Saltine crackers, sweetened condensed milk, citrus juice, sugar, and eggs, as Food & Wine frames it. What takes a little care is the technique around chilling and cutting.