In a large bowl, combine ground chicken, cheddar cheese, ranch seasoning, breadcrumbs, egg, salt, and pepper.
Mix until well combined and form into 4 patties.
Heat a grill or skillet over medium heat and cook patties for 6-7 minutes on each side, or until fully cooked.
Toast hamburger buns if desired and assemble burgers with lettuce, tomato, and onion.