This French onion smash burger recipe combines crispy-edged beef patties, sweet caramelized onions, melted Swiss cheese, and toasted brioche buns for an incredible homemade cheeseburger.
If you love French onion soup and juicy smash burgers, this easy comfort-food recipe brings both together in one delicious bite. Perfect for burger night, weekend grilling, or a restaurant-style dinner at home.
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Ingredients
Makes 4 burgers
– 1½ lb ground beef (80/20)
– 4 brioche burger buns
– 8 slices Swiss cheese
– 3 large yellow onions, thinly sliced
– 2 tablespoons butter
– 1 tablespoon olive oil
– 1 teaspoon Worcestershire sauce
– 1 teaspoon garlic powder
– Salt and black pepper, to taste
– 2 tablespoons mayonnaise
– 1 teaspoon Dijon mustard
– Neutral oil for the griddle
Instructions
1. Heat butter and olive oil in a skillet over medium-low heat. Add sliced onions and cook for 25–35 minutes, stirring regularly, until deeply golden and caramelized. Stir in Worcestershire sauce.
2. Divide beef into 8 loose balls. Season with salt, pepper, and garlic powder.
3. Heat a griddle or heavy skillet until very hot. Add a little oil, place beef balls on the surface, and smash each into a thin patty using a sturdy spatula.
4. Cook until the edges are deeply browned, about 2 minutes. Flip and cook until the beef reaches 160°F. Add Swiss cheese and let it melt.
5. Toast the brioche buns. Mix mayonnaise and Dijon mustard, then spread onto the buns.
6. Stack two patties per bun, add a generous portion of caramelized onions, and top with the bun.
7. Serve immediately while the beef edges are crispy and the cheese is melted.
Nutrition
Approximate per burger:
– Calories: 850
– Protein: 43 g
– Carbohydrates: 43 g
– Fat: 54 g
– Sodium: 1,050 mg
Nutrition varies with beef fat content, bun size, cheese brand, and portion sizes.