Form the ground turkey into four round hamburger patties. Sprinkle with salt and fresh ground pepper, to taste.
Fry hamburger patties on a cast-iron griddle over medium-low heat up to 4-5 minutes without moving per side.
Serve the hamburger patties on the toasted buns, topped a slice of cheese, lettuce, tomato, onion, mayonnaise, and ketchup, to taste.