In a skillet over low heat, add the sliced onions with a pinch of salt. Cook them for about 20 minutes, allowing the natural sugars to caramelize until they turn a gorgeous golden brown. When finished, carefully remove the onions from the skillet and set them aside.

Divide your ground beef into four equal portions, shaping them into patties. Season generously with salt and pepper. In the same skillet where you cooked the onions, add the patties and cook for about 4 minutes per side.

In a mixing bowl, combine half a cup of mayonnaise, two tablespoons of ketchup, one tablespoon of Worcestershire sauce, one teaspoon each of garlic powder and onion powder, and two teaspoons of freshly ground black pepper. Whisk these together until smooth and well-blended.

Butter one side of each slice of Texas toast generously. On the unbuttered side, spread a generous amount of your creamy pepper sauce, followed by a slice of cheese and a beef patty. Top this with the caramelized onions, another slice of cheese, and place another slice of buttered bread on top, buttered side facing out.

Place the assembled sandwich in the skillet, cooking until golden brown, about 3-4 minutes on each side, ensuring the cheese melts beautifully.

Once toasted to perfection, cut your sandwiches in half diagonally and serve them hot. Pair with crispy fries or a fresh salad.