To make crust: Preheat oven to 350 degrees and spray a pie dish with cooking spray, set aside.
In a large bowl, combine oats, oat flour, sugar and sea salt. Cut in coconut oil and mix until crumbly. Add a small amount of water if needed to create a crumbly dough. Firmly press dough onto the bottom and sides of pie pan. Bake for 15 minutes or until lightly golden. Remove from oven and set aside.
To make pie filling, add all ingredients to a large bowl and stir until well coated. Let sit for 15 minutes.
To make crumble topping add oats and sugar to a small bowl. Cut in coconut oil until crumbly. Set aside.
Pour pie filing into to pie crust and add crumble topping. Place pie on a cookie sheet and bake at 425 degrees for 20 minutes. Lower heat to 400 degrees and bake for 30 minutes. Lower heat again to 350 degrees and bake for an additional 20-30 minutes or until pie is bubbly. Serve warm or cooled and enjoy :)