In a medium bowl, whisk together the all-purpose flour, oats, brown sugar, cinnamon, ginger and sea salt. Add in the cold butter and using your fingers, rub the butter into the dry ingredients until it turns into small crumbles.
Evenly top the cheesecake filling with diced apples and then the streusel crumble, ensuring that topping is well packed within the cupcake cavity.
Bake the cheesecakes for 20-25 minutes, then turn off the oven and allow them to sit in the oven for another 5 minutes with the oven door halfway open to avoid cheesecakes from deflating. **NOTE: When baking, I always prepare a medium pot with water and add it to the oven as well, to keep cheesecake temperature even and to add moisture.**
Remove cheesecakes from the oven and allow them to continue to cool for another 15-20 minutes, before putting them in the refrigerator for at least an hour.
Once cooled, drizzle with homemade salted caramel sauce and enjoy!