01 - Set a large skillet or griddle over medium-high heat. Add 1 tablespoon of 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 achieve a 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 - Stir in the finely diced onion and cook for 3 to 4 minutes until translucent and softened. Add the minced garlic and cook for 1 additional minute until fragrant.
04 - Add the chopped dill 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 thickened and saucy.
05 - While the meat simmers, butter the cut sides of the hamburger buns and toast them on a separate pan or griddle over medium heat until golden brown and crisp.
06 - Lay the cheese slices directly over the hot beef mixture and allow them to melt slightly from the residual heat. 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.