In a large bowl, combine the chicken, apple, celery, poultry seasoning, 1/2 cup breadcrumbs, salt and pepper.
Shape into 4 to 6 patties. Dredge the patties in remaining 1/2 cup breadcrumbs.
In a skillet over medium heat, drizzle a little olive oil and get pan warm. Cook burgers for about 4-5 minutes per side, or until cooked to 165 degrees internally.
To serve, spread cranberry sauce (we like mayo too) on buns with burgers, and top with more apples if desired.