Install grill grate in unit and close hood. Select GRILL, set temperature to HIGH, and set time to 8 minutes for medium-cooked burgers. Select START/STOP to begin preheating.
While unit is preheating, divide ground beef into 4 portions and hand-form each into a loosely formed 4-inch patty. Use your thumb to make a 1/2-inch indent in the center of each patty (this will help the burgers keep their shape uniform during cooking). Season patties with salt and pepper, as desired.
When the unit beeps to signify it has preheated, place patties on the grill grate, gently pressing them down to maximize grill marks.
After 6 minutes, place a slice of cheese on each patty. Close hood to continue cooking for 1 minute.
After 1 minute, remove cheeseburgers from grill grate. Place the buns on the grill grate. Close hood and cook for the remaining 1 minute.
When cooking is complete, serve cheeseburgers on the toasted buns with the condiments of your choice.