Slice the sweet yellow onions thinly and heat a large skillet over medium heat. Add 2 tablespoons of butter and toss in the onions, stirring occasionally. Cook for about 20-25 minutes until they are golden brown and caramelized.

Once the onions are caramelized, sprinkle them with salt and black pepper. Pour in a splash of beef broth—about ¼ cup—to deglaze the pan. Continue cooking for an additional 5 minutes.

While the onions finish cooking, shape the ground beef into thick patties, seasoning generously with salt and pepper. Preheat your grill or skillet over medium-high heat.

Place the seasoned patties on the preheated grill or skillet, cooking for about 4-5 minutes. Flip and add cheese on top. Cook for an additional 3-4 minutes.

Slice the brioche buns in half and toast them on a separate skillet or under the broiler for about 1-2 minutes until golden brown.

Gather your toasted buns, placing the caramelized onion mixture on the bottom half of each bun, followed by the cheese-topped burger patty and fresh herbs.

Top off the burger with the other half of the bun and serve with a side of crispy fries or a fresh salad.