French Onion Soup Burger Recipe by Tasty
This French Onion Soup Burger is the ultimate smash burger experience: a triple-stacked, mustard-fried masterpiece blanketed in a rich, silky Gruyère and white cheddar French onion cheese sauce that cascades right down the sides. It's surprisingly doable on a weeknight and uses a clever ring mold trick to get that dramatic, restaurant-worthy sauce pour at home. The burgers are smashed thin and crispy on a screaming-hot cast-iron skillet, layered with Swiss cheese and jammy caramelized onions, then finished with crispy fried onions for crunch.