01 - Place a large skillet or griddle over medium-high heat. Add 1 tbsp unsalted butter and allow it to melt completely, coating the surface evenly.
02 - Add the ground beef to the skillet, spreading it into an even layer. Press down firmly with a spatula to create a flat smash-burger crust. Let it cook undisturbed for 2 to 3 minutes until a deep brown sear forms, then break the meat apart into crumbles.
03 - Add the finely diced onion to the beef and cook for 3 to 4 minutes until softened and translucent. Stir in the minced garlic and cook for 1 additional minute until fragrant.
04 - Stir in the chopped dill pickles, ketchup, yellow mustard, Worcestershire sauce, brown sugar, smoked paprika, black pepper, and salt. Mix thoroughly and bring to a simmer. Cook for 5 to 7 minutes, stirring occasionally, until the mixture thickens into a rich, saucy consistency.
05 - While the meat mixture simmers, butter the cut sides of the hamburger buns. Place them face-down on a separate pan or griddle over medium heat and toast until golden brown, about 1 to 2 minutes.
06 - Lay the cheese slices directly over the hot beef mixture. Allow them to soften and melt slightly from the residual heat, then remove the skillet from the burner.
07 - Spoon the cheesy beef mixture generously onto the bottom half of each toasted bun. Add sliced tomato and shredded lettuce if desired. Cap with the top bun and serve immediately while hot.