Shape beef into 8 thin patties. Divide cheese among 4 patties; top with remaining patties and press edges firmly to seal. Sprinkle with salt and pepper. , Grill burgers, covered, over medium heat or broil 4 in. from heat until a thermometer reads 160° and juices run clear, 6-8 minutes on each side. Serve on buns with toppings of your choice.