In a medium bowl, combine egg, apple, cracker crumbs, salt, sage, nutmeg, pepper, cayenne, and parsley if using. Stir. Add turkey and mush all ingredients together with your hands, as you would for meatballs. Form into eight patties, each about 2 inches long and 1/2- to 3/4-inch thick.
Spray a large nonstick skillet with cooking spray and heat over medium heat. Once hot, add patties. Cook until first side is browned, 4 to 6 minutes. Flip. Do the same to the other side. Cut into one patty to make sure everything is cooked through. Serve hot.
Original recipe called for 1/4 C finely diced onions - too strong a flavor.