01 - Heat a large skillet or griddle over medium-high heat. Add 1 tbsp butter and allow it to melt completely across the cooking surface.
02 - Add the ground beef to the skillet, gently spreading it into an even layer. Press down firmly with a spatula to achieve the smash burger effect. Let it cook undisturbed for 2–3 minutes until a deep brown crust forms, then break the meat apart into crumbles.
03 - Add the diced onion to the browned beef and cook until softened, about 3–4 minutes. Stir in 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 5–7 minutes until thick and saucy.
05 - While the beef mixture simmers, butter the cut sides of the hamburger buns and toast them on a pan or griddle over medium heat until golden brown.
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 a generous portion of the cheesy beef mixture onto the bottom half of each toasted bun. Add sliced tomato and shredded lettuce if desired, then cap with the top bun. Serve immediately.