Place eggs, milk, sugar, cinnamon, apples and vanilla in a medium mixing bowl and stir to combine.
Mist bottom of a 12-by-8-inch glass baking dish with cooking spray or brush with melted butter. Place bread slices in a single layer in pan. Pour egg mixture over bread. Turn bread slices over to coat other side. Cover pan with plastic wrap and place in refrigerator overnight.
When ready to serve, preheat oven to 425°F Remove pan from refrigerator and remove plastic wrap. Sprinkle pecans over top and drizzle with melted butter. Bake 20 to 25 minutes or until bread slices puff. Serve with maple syrup.