Place challah in a food processor (Bowl for ninja) and pulse until roughly chopped. Set aside

Place apples in a food processor (ninja bowl) until chopped

Place eggs, milk, sugar, vanilla, cinnamon, nutmeg and salt in food processor (ninja bowl- level 2) and blend.

Place bread pieces into a lightly buttered 9x13-in baking dish and layer the chopped apples over the bread. Pour egg mixture over every. Cover and refrigerate for 10 minutes.

Preheat oven to 350°F. Bake casserole for 40-45 minutes, until eggs are set and top is lightly golden. Serve drizzled with maple syrup.