01 - Set a large skillet or griddle over medium-high heat. Add 1 tbsp unsalted butter and allow it to melt completely across the cooking surface.
02 - Add the ground beef to the hot skillet, spreading it into an even layer. Firmly press down with a spatula to achieve the signature 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 the finely diced onion into the browned beef and cook for 3 to 4 minutes until softened and translucent. Add the minced garlic and continue cooking for 1 minute until fragrant.
04 - Add the chopped dill pickles, ketchup, yellow mustard, Worcestershire sauce, brown sugar, smoked paprika, black pepper, and salt to taste. Stir thoroughly to combine, then reduce heat and let the mixture simmer for 5 to 7 minutes until thick and saucy.
05 - While the meat mixture simmers, butter the cut sides of each hamburger bun. Place them buttered-side down on a separate pan or griddle over medium heat and toast until golden brown.
06 - Lay one slice of cheese over the hot meat mixture in the skillet. Allow the cheese to soften and begin melting 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.