01 - Set a large skillet or griddle over medium-high heat. Add 1 tbsp unsalted butter and allow it to fully melt across the cooking surface.
02 - Add the ground beef to the skillet, spreading it into an even layer. Press down firmly with a spatula to achieve the signature smash burger crust. Cook undisturbed for 2 to 3 minutes until a deep brown sear forms, then break the meat into smaller pieces.
03 - Stir in the finely 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 let the mixture simmer for 5 to 7 minutes until thick and saucy.
05 - While the meat simmers, butter the cut sides of each hamburger bun. Place them buttered-side down on a pan or griddle over medium heat and toast until golden brown.
06 - Lay the cheese slices directly over the hot meat 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, then cap with the top bun. Serve immediately while hot.