Heat oil in a small saute pan over medium heat, and cook onion until translucent and soft, about 3 minutes. Add apples and cook until soft, about 5 minutes. Let cool.
Combine chicken with onion-apple mixture and remaining ingredients, mixing with your hands. Form into 1 1/2-inch-round patties, and chill until ready to use.
Preheat oven to 350 degrees. Heat a little oil in a medium ovenproof saute pan, and brown patties over medium-low heat 2 minutes on each side; transfer pan to oven, and bake until cooked through, about 10 minutes.