Prepare Meat: Divide the ice-cold ground beef into four equal portions, roll them into loose balls, and chill them in the refrigerator.

Heat Skillet: Preheat your cast iron skillet over medium-high heat until it starts to lightly smoke.

Sear Patties: Place the chilled beef balls into the hot skillet and press each ball down firmly to create a thin patty.

Season & Cook: Sprinkle kosher salt and black pepper over the patties and allow them to sear undisturbed for about 2 minutes.

Melt Cheese: Flip the patties, add a slice of cheese on each, and cover the skillet for about 30 seconds to melt the cheese.

Assemble Burger: Place the cheesy patties on the buttered brioche buns, drizzle with burger sauce, and cap with the top bun.