Melt the dairy free butter in a skillet over medium heat. Add the apples, brown sugar, lemon juice, and cinnamon, then cook for 7 to 9 minutes until the apples are tender.
Stir the cornstarch with 1 tbsp of water and add it to the apples. Cook for 1 minute until the filling thickens, then cool completely.
Whisk the coconut cream, oat milk, brown sugar, cornstarch, cinnamon, nutmeg, and sea salt in a saucepan until smooth.
Cook the ice cream base over medium heat for 5 to 7 minutes, whisking constantly, until lightly thickened. Stir in the vanilla extract.
Refrigerate the ice cream base and apple pie filling separately for at least 4 hours.
Toss the crumbled dairy free pie crust with sugar and cinnamon. Bake at 350 F for 8 to 10 minutes, then cool completely.
Churn the cold ice cream base in an ice cream maker until thick and creamy.
Layer the ice cream with the apple pie filling and pie crust crunch, cover with parchment paper, and freeze for 4 hours.