Divide the ground beef into 16 mini burgers (almost the size of meatballs, but flatter). Spray a skillet with cooking spray and place the mini burgers in the skillet. Cook over medium heat for about 3-4 minutes on each side, depending on how you like your burgers cooked. Once the burgers are brown on each side, place a slice of cheese on each burger. Lower the heat to low and place a lid on the skillet to cook the inside of the burger. Allow the burgers to cool before assembling. To assemble the kabobs: start with the mini cheeseburgers followed by the lettuce, tomatoes and pickles. Serve with ketchup or any other of your favorite burger toppings.