If you love the rich, savory flavors of French onion soup, these Juicy French Onion Burgers with Gruyère bring that same irresistible combination to a classic burger. Each juicy beef patty is topped with slowly caramelized onions, melted Gruyère cheese, fresh thyme, and a touch of Dijon mustard, all tucked into a toasted brioche bun.

The secret is simple: give the onions time to caramelize properly. As they slowly cook, they become soft, deeply golden, sweet, and almost jammy. Combined with nutty Gruyère and a well-seasoned beef patty, they turn an ordinary burger into a restaurant-style dinner you can make at home.

Why You’ll Love These French Onion Burgers

• Rich caramelized onions create deep, savory-sweet flavor.
• Gruyère cheese melts beautifully and adds a nutty finish.
• 80/20 ground beef keeps the patties juicy and flavorful.
• Dijon mustard adds brightness without overpowering the burger.
• Toasted brioche buns provide the perfect contrast to the soft toppings.
• Most of the preparation can be done in one skillet.

Ingredients

For the Caramelized Onions

• 2 large yellow onions, thinly sliced
• 1 tablespoon butter
• 1 tablespoon olive oil
• ¼ cup beef broth, plus more as needed
• 1 teaspoon fresh thyme leaves
• Salt and black pepper, to taste

For the Burgers

• 1½ pounds 80/20 ground beef
• 1 teaspoon Worcestershire sauce
• ½ teaspoon garlic powder
• Salt and black pepper, to taste
• 4 slices Gruyère cheese
• 4 brioche or potato buns
• Dijon mustard, for serving
• Fresh thyme, for garnish