Divide the ground beef into four loose balls, avoiding over-handing to keep it tender.
Preheat your skillet over medium-high heat until it's hot and slightly shimmering, with a faint smoke in the air.
Place a beef ball onto the hot skillet and immediately press down firmly with a spatula, smashing it into a thin, even patty about ΒΌ inch thick. You should hear a loud sizzle and see bubbles of fat forming around the edges.
Sprinkle a pinch of salt on top of each patty right after pressing, enhancing the flavor and helping form a crisp crust.
Cook the patties for about 2-3 minutes without moving them; they should develop a deep golden-brown crust and smell nutty and caramelized.
Use a spatula to flip each patty carefully, revealing a crispy, crackling crust on the other side. Immediately place a slice of cheese on each patty, allowing it to melt as the burger finishes cooking.
While the burgers cook for another 1-2 minutes, lightly toast the potato buns in the same skillet until golden and slightly crisp.
Assemble each burger by placing the cheese-topped patty on the bottom bun, then adding pickles and sliced onions for crunch and tang. Top with the other bun.
Serve immediately while the crust is crispy and the cheese is gooey, with plenty of sizzle and aroma filling the air.
