Directions:
1. Caramelize the Onions:
– In a large skillet over medium heat, melt the butter.
– Add the sliced onions and sugar, and cook, stirring occasionally, until the onions are deeply caramelized and sweet, about 20-25 minutes.
– Add a splash of beef broth if the onions start to stick, to deglaze the pan.
2. Prepare the Burger Patties:
– Season the ground beef with salt, pepper, and Worcestershire sauce.
– Form into 4 equal-sized patties.
3. Cook the Patties:
– In a separate skillet or on a grill, cook the burger patties to your desired level of doneness.
4. Prepare the Buns:
– If desired, prepare garlic butter buns by spreading buns with a mixture of butter and minced garlic, then toasting until golden.
5. Assemble the Burgers:
– On each bun bottom, place a cooked burger patty.
– Top each patty with a generous helping 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 cheese, cover with bun tops, and serve immediately.
**Prep Time:** 15 minutes | **Cooking Time:** 30 minutes | **Total Time:** 45 minutes
**Calories:** 650 kcal per burger | **Servings:** 4 servings
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