In a large bowl, add the ground beef, Worcestershire sauce, Dijon mustard, garlic powder, salt, and pepper. Mix until evenly combined, do not overmix.
Divide the beef into four equal portions. Using your hands, roll into balls and then flatten into patties about 1/2” thick. Use your thumb and gently press into the center of each patty to create an indentation. This helps the burger keep its shape while cooking.
Open the lid, place the grill plate inside of the basket. Select Grill L5. Press Time and set for 12 Minutes. Press Start.
Once the grill has finished preheating and displays Add Food, place the beef patties on the grill. Close the lid.
When the unit displays Turn Food carefully flip the burgers over. Close the lid.
When there is 1 minute remaining on the timer add your cheese slices on top of the burgers.
Once the cooking time has finished serve them immediately on buns with your favorite toppings.