Make the crust: Combine graham cracker crumbs, brown sugar, and melted butter. Press into the bottom of your springform pan.
Prepare the cheesecake filling: Beat cream cheese and sugar until smooth. Add eggs, vanilla, sour cream, and lemon juice. Mix until creamy.
Prepare the cinnamon apple topping: Toss apples with cinnamon, sugar, and lemon juice. Set aside.
Make the crumble: Combine oats, almond flour, and brown sugar. Add cold butter and rub together until a crumbly texture forms.
Assemble the cheesecake: Pour cheesecake mixture over the crust. Layer cinnamon apples and top with crumble mixture.
Bake: Preheat your oven to 325°F (163°C). Bake for 50-55 minutes, or until the cheesecake is set.
Cool and refrigerate: Let the cheesecake cool before refrigerating for at least 2 hours.