Comforting, impressive, delicious, and easy.
Heat oven to 425 degrees. Pour butter into a pie plate, 9-by-9-inch baking dish, or 9-inch ovenproof frying pan. Lay apple slices and nuts in pan and bake about 5 minutes, or until apples begin to soften and nuts are lightly toasted. Using a standing or electric mixer, beat eggs, milk, flour, sugar, vanilla, cinnamon, and salt together. Remove dish from oven. Mist edges of dish with nonstick cooking spray. Pour batter into dish and sprinkle with brown sugar. Bake about 20 minutes, or until edges puff and brown and center is set. Serve with maple syrup while hot.