Prepare the crumble topping by mixing the oats, oat flour, coconut sugar and salt in a bowl. Add the coconut oil and mix with your hands to work the oil into the dry ingredients to create a crumble. Set aside.
Heat an 8" skillet on medium heat. Add the sliced cherries, strawberries and raspberries. Mix in the vanilla extract, orange zest and maple syrup.
Cook the berries for about 5-6 minutes. Once they begin to bubble, add in the tapioca flour. Cook for another 5-6 minutes to let the mixture thicken.
Remove the pan from the fire and cover the berries with the crumble topping. Place the pan into the oven and bake for 25-30 minutes.