Prepare the ingredients as instructed.
Preheat a griddle or skillet over medium heat.
Saute the onion until translucent.
Add the ground beef, chopping it into small pieces. Season with salt, black pepper, and garlic powder, mixing well with the onions.
Place the American cheese and cheddar cheese over the beef mixture and allow the cheese to melt. Mix gently to combine with the meat.
Toast the buns under the oven broiler until golden brown.
Spread mayonnaise and ketchup inside the toasted rolls.
Portion the chopped beef mixture onto the buns. Top with lettuce and tomato.
Pour sparkling water over lemon slices and serve over ice cubes.
Serve the chop cheese with carrot sticks and hummus alongside lemon sparkling water.