Irresistible French Onion Soup Burgers 
Ingredients:
1 lb ground beef
2 large onions, thinly sliced
2 tablespoons butter
1 teaspoon sugar
1/2 cup beef broth
2 tablespoons Worcestershire sauce
1 teaspoon fresh thyme leaves (or 1/2 teaspoon dried thyme)
Salt and pepper to taste
4 slices Gruyère or Swiss cheese
4 hamburger buns
1 clove garlic, minced (optional for garlic butter buns)
Additional butter for buns
Directions:
1. Caramelize the Onions:
In a large skillet over medium heat, melt the butter.
Add the sliced onions and sugar. Cook and stir occasionally until the onions are deeply caramelized and sweet, about 20-25 minutes. Deglaze the pan with a splash of beef broth if the onions start to stick.
2. Prepare the Burger Patties:
Season the ground beef with salt, pepper, and Worcestershire sauce.
Form the mixture into 4 equal-sized patties.
In a separate skillet or on a grill, cook the burger patties to your desired level of doneness.
3. Assemble the Burgers:
For garlic butter buns (optional), mix butter with minced garlic, spread it on the buns, and toast until golden.
Place a cooked burger patty on each bun bottom.
Top each patty with a generous portion of caramelized onions and a slice of cheese.
Broil the assembled burgers for a few minutes until the cheese is melted and bubbly.
Sprinkle fresh thyme over the melted cheese, cover with the bun tops, and serve immediately.
Prep Time: 15 minutes
Cooking Time: 30 minutes
Total Time: 45 minutes
