01 -
Peel the yellow onion and cut into four rounds, each 1/2 inch thick. Arrange the slices on a plate and drizzle with olive oil and Worcestershire sauce. Sprinkle with a pinch of Creole seasoning and brown sugar. In a skillet over medium-low heat, caramelize the onions for 10 minutes per side, turning gently, until deeply browned and tender.
02 -
Season the ground beef with Creole seasoning in a mixing bowl. Divide into four equal portions, shape each into a ball, and flatten to create thin patties.
03 -
Heat a skillet over medium-high heat. Sear the patties for 2 to 3 minutes on each side until cooked through and a crust forms.
04 -
Place a slice of American cheese on each patty during the final minute of cooking and allow to melt completely.
05 -
In a bowl, whisk together mayonnaise, relish, Dijon mustard, Worcestershire sauce, sugar, garlic powder, onion powder, smoked paprika, Creole seasoning, and cayenne pepper until smooth.
06 -
Arrange a caramelized onion slice on a plate as the bottom bun. Top with a cheese-topped patty, spoon over the prepared sauce, and finish with another onion slice as the top bun. Repeat the process for all servings.
07 -
Serve immediately with additional sauce on the side as desired.