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