1Preheat your grill or skillet over medium-high heat.
Place the beef patties on the grill or skillet and cook for about 3-4 minutes on each side, or until they reach your desired level of doneness.
During the last minute of cooking, place a cheese single on top of each patty to melt.
While the patties are cooking, lightly toast the burger buns on the grill or in a toaster.
Once the patties are cooked and the cheese is melted, remove them from the heat.
Assemble the burgers by placing a beef patty with melted cheese on the bottom half of each bun.
Add a tablespoon of ketchup on top of each patty.
Place the top half of the bun on each burger.
Serve the cheeseburgers immediately and enjoy!