Divide the ground beef into 4 equal portions (about 2 ounces each). Gently form them into loose balls, do not overwork the meat.
Heat a cast-iron skillet or griddle over medium-high heat. Add a little oil if your skillet is not well-seasoned.
Place the beef balls onto the hot skillet, leaving some space between them. Immediately smash each ball down with a sturdy spatula or burger press until it's about 0.5 inch thick.
Season the smashed patties generously with salt and pepper.
Cook for about 2 minutes, or until the bottom is well-browned and crispy. Flip the patties.
Place a slice of cheddar cheese on each patty. Cook for another 1-2 minutes, or until the cheese is melted and the patty is cooked through.
While the burgers are cooking, lightly butter the cut sides of the burger buns and toast them in a separate pan or on the griddle until golden brown.
Assemble the burgers by placing the cooked patties on the toasted buns. Add your favorite toppings and condiments.
Notes
Serve immediately for the best crispy texture. Customize with your favorite toppings like lettuce, tomato, onion, pickles, and sauces.