Preheat the oven to 350°F (175°C).
Arrange apples in a 9x13-inch baking dish. In a bowl, cream together butter and brown sugar. Stir in flour, instant oatmeal, and salt. Fold in chopped walnuts. Sprinkle the oatmeal mixture evenly over apples. Drizzle with maple syrup.
Bake for 50 to 70 minutes until apples are tender and topping is golden.
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