Buttery Smashed Jack

What is it?

Single beef patty gets smashed on the griddle, then topped with garlic-herb butter, American cheese, caramelized onions, and special sauce on an enriched bun. Butter is the main variable here, melting into the meat and bread while the onions bring a sweet, cooked-down note. Compared with Jack in the Box's standard burgers, this line leans into the smashburger format: thinner patty, more browned edges, and a softer bun built to catch the drippings. It's part of a lineup from the chain that uses the same basic structure across the range with different toppings, keeping the garlic-herb butter as the constant across every build.