Creating the Apple Crisp Cheesecake can be done effortlessly by following these straightforward steps:

1. Preheat the Oven: Preheat your oven to 325°F (160°C). Grease a 9-inch springform pan.

2. Prepare the Apple Filling: In a bowl, mix the diced apples with lemon juice, cinnamon, nutmeg, and brown sugar. Set aside to let the flavors mingle.

3. Make the Cheesecake Batter: In a large mixing bowl, beat the softened cream cheese until smooth. Gradually add the granulated sugar and vanilla, mixing well.

4. Add Eggs and Sour Cream: Add the eggs one at a time, mixing on low speed. Then, fold in the sour cream and flour until just combined.

5. Layer the Apples: Spread half of the cheesecake batter into the bottom of the prepared springform pan. Evenly distribute the apple filling over the batter, then pour the remaining cheesecake batter on top.

6. Prepare the Crisp Topping: In another bowl, combine rolled oats, flour, brown sugar, cinnamon, and a pinch of salt. Drizzle melted butter over the mixture and stir until well combined. Sprinkle the topping over the cheesecake layer.

7. Bake: Place the springform pan in the preheated oven and bake for 55-60 minutes, or until the edges are set and the center slightly jiggles.

8. Cool the Cheesecake: Once baked, turn off the oven and leave the cheesecake inside for about an hour to cool gradually. Then, remove it from the oven and let it cool completely on a wire rack.

9. Refrigerate: Once cooled, cover the cheesecake and refrigerate for at least 4 hours, preferably overnight. This allows the flavors to meld perfectly.

10. Serve: Before serving, run a knife around the edge of the springform pan to loosen the cheesecake. Carefully remove the sides of the pan.