Preheat the oven to 375 degrees F.
Peel, core, and cut the apples into thin slices. Place them in a 9 by 13-inch baking dish. In a bowl with a pastry cutter, mix the remaining ingredients until they are well blended and resemble coarse cornmeal. Sprinkle the mixture over the apples, and bake until apples are tender, about 30 to 35 minutes. Serve warm or cold.