Oats are gluten free but can sometimes be cross contaminated from being processed on the same machinery as wheat. So they have to be purchased certified gluten free.
If you don't normally cook gluten free and don't have the right ingredients, then a big old crust free apple pie would go over just fine. (Just some good cooked apple pie filling).
Bob's Red Mill sells a gluten free flour that is OK. It's adequate for making a crisp topping for an apple crisp. Just make sure it is thoroughly cooked because it contains garbanzo beans which are bitter when they are raw, but fine to eat when they are fully cooked.
Forget about making gluten free pie crust. I've been trying for years now and still haven't figured out how to make a good one. I do a shortbread cookie under cream pie, but it gets soggy really fast and if you try to cook with it, the crust floats up into the filling.