Smash and sear the patties (6 minutes total)
Heat a skillet or griddle over medium-high until very hot. Place a beef ball down and smash firmly with a spatula until about 1 cm thick. Season with salt and pepper. Cook for ~2 minutes until the edges crisp, then flip. Add cheese to two of the patties and cook another 1–2 minutes. You should end up with 2 cheesy patties and 2 plain ones.