cheeseburger is a hamburger with cheese. It is typically made with ground beef, but can also be made with other meats, such as chicken, turkey, or lamb. The cheese is usually American cheese, but can also be cheddar, Swiss, or other types of cheese. Cheeseburgers are often served with lettuce, tomato, onion, and pickles. They can also be served with other toppings, such as bacon, avocado, or mushrooms.