Preheat oven to 350°.
To prepare filling, combine the first 3 ingredients, tossing well. Place apple mixture in an 11 x 7-inch baking dish coated with cooking spray.
To prepare topping, lightly spoon the flour into a dry measuring cup, and level with a knife. Combine flour and the next 5 ingredients (through nutmeg), stirring with a whisk. Cut in butter with a pastry blender or 2 knives until mixture resembles coarse meal. Sprinkle butter mixture evenly over apple mixture. Bake at 350° for 30 minutes or until filling is bubbly and topping is golden. Serve with vanilla light ice cream.