Preheat your oven to 375 degrees. Prepare a casserole dish or pie plate with cooking spray and set aside.
In a small saucepan, over low heat, combine brown sugar, ¼ cup flour, ¼ teaspoon salt, water and vinegar. Cook over low heat, stirring until thick. Cover and set aside on your stove.
In a medium sized bowl combine baking powder, 1 cup flour and ¾ teaspoon salt. Cut in 3 tablespoons of shortening with a fork until mixture looks like crumbs. Add the milk and mix just until moistened into a sticky dough. Set aside.
Arrange your peeled and sliced apples in your prepared casserole dish or deep pie plate. Sprinkle with cinnamon until apples are lightly coated. If you are adding nuts or raisins, sprinkle them all over top of the apples.
Add nutmeg, vanilla and butter to your sauce on your stove. Stir until incorporated. Pour over top of your apples.
Grab two large soup spoons and scoop the dough with one spoon and drop it on top of the apples in your casserole dish with the other spoon.
Bake for 40 minutes or until topping is golden brown and done. Serve warm with whipped or ice cream if desired. Enjoy!