Making these Apple Crisp Mini Cheesecakes can be a fun and rewarding process. Just follow these easy steps to create your delicious treats:

1. Preheat the Oven: Preheat your oven to 325°F (163°C). Line a muffin tin with cupcake liners to prepare for the mini cheesecakes.

2. Prepare the Crust: In a medium bowl, mix together graham cracker crumbs, granulated sugar, and melted butter until fully combined.

3. Press the Crust: Evenly divide the crust mixture among the lined muffin cups. Press it down firmly with the back of a spoon or your fingers to form a solid base.

4. Make the Cheesecake Filling: In a large mixing bowl, beat the softened cream cheese with an electric mixer until smooth. Gradually add the granulated sugar and vanilla extract, mixing until well incorporated.

5. Add Eggs: Add the eggs one at a time, beating on low speed after each addition until just combined. Avoid overmixing.

6. Fold in Apples and Spices: Gently fold in the diced apples, ground cinnamon, and nutmeg (if using) until evenly distributed throughout the cheesecake batter.

7. Fill the Muffin Tin: Spoon the cheesecake batter over the prepared crusts in the muffin tin, filling each liner about three-quarters full.

8. Prepare the Topping: In a separate bowl, combine rolled oats, all-purpose flour, brown sugar, softened butter, and ground cinnamon. Mix with a fork until crumbly.

9. Add Topping: Sprinkle a generous amount of the oat topping onto each mini cheesecake. This will give it that iconic apple crisp texture.

10. Bake: Place the muffin tin in the preheated oven and bake for 20-25 minutes, or until the edges are set and the centers appear slightly jiggly.

11. Cool the Mini Cheesecakes: Once baked, remove the muffin tin from the oven. Allow the mini cheesecakes to cool at room temperature for about 20 minutes. Then, transfer them to the refrigerator to chill for an additional 20-25 minutes.

12. Serve: Once cool, carefully remove the mini cheesecakes from the muffin tin. They can be served chilled or at room temperature as desired.