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Twix is one of the few bars where a baked element carries the structure. The shortbread finger underneath is rigid enough to hold caramel without collapsing, which is why the bar snaps rather than bends. Salting the caramel is the useful change. Caramel, biscuit and milk chocolate are all built on sugar and butter with nothing sharp between them, so salt is the only thing in a salted version pulling in another direction. It works chemically as well as by taste: salt suppresses bitterness and stops sweetness reading flat, and that's more noticeable in a bar this uniformly sweet than in most.