Preheat your oven to 350F and grease a baking dish. I used an 11x8 pan.
Peel, core, and slice your apples about 1/8 inch thick.
Toss slices in mixing bowl with lemon juice, maple syrup, vanilla, cinnamon, nutmeg, and arrowroot powder. Set aside while preparing crumble.
In a bowl, mix together oats, almond flour, salt, cinnamon, and vanilla.
Pour in maple syrup and melted coconut oil. Stir until well combined.
Pour apples into greased baking dish, including the liquid in the bottom of the bowl.
Add dollops of cobbler mixture onto apples, evenly dispersing and covering as much of the top as possible.
Bake for 45-50 minutes, covering top halfway through with aluminum foil if starting to brown.
Serve warm with vanilla ice cream.