Preheat your oven to 325°F (160°C).
Prepare the crust by mixing graham cracker crumbs and melted butter.
Press the mixture into the bottom of a springform pan and bake for 10 minutes.
In a large mixing bowl, beat the cream cheese and granulated sugar until smooth.
Add the vanilla extract and eggs, incorporating them one at a time until fully combined.
Pour the cream cheese mixture over the baked crust and set aside.
Prepare the apple filling by tossing sliced apples with cinnamon and brown sugar.
Layer the spiced apples over the cheesecake mixture in the springform pan.
In a separate bowl, combine oats, brown sugar, and remaining melted butter for the crumble topping.
Spread the crumble evenly over the apple topping.
Bake the cheesecake for 60-70 minutes until the edges are set but the center is slightly jiggly.
Allow the cheesecake to cool completely before refrigerating for at least 4 hours.
Carefully remove the cheesecake from the springform pan and serve chilled.