Mix together sliced apples and lemon juice together. Blend sugar, cinnamon, nutmeg and vanilla together. Toss raisins with flour. Mix all together and place in 9 inch pie plate or baking dish.
For the topping blend and crumble over apple mixture. Bake at 375 for 30 minutes or until golden brown. Cover then bake an additional 10 minutes or until apples are cooked through. Let cool a bit and serve.