Start With Room Temperature Ingredients. Before you begin the cheesecake filling, keep in mind that you MUST use room temperature ingredients for a smooth filling!
Combine Cream Cheese & Sugar. In the bowl of a stand mixer (or a large mixing bowl), combine softened cream cheese and 1 cup sugar. Beat on medium speed with a paddle attachment or electric mixer 2-3 minutes, or until smooth and evenly blended. Stir through with your spatula to check for any lumps!
Finish The Filling. Next, add sour cream, 1/3 cup caramel sauce, the cornstarch, and the vanilla. Mix on LOW speed until just combined. Scrape down the sides and bottom of the bowl and add eggs one at a time, mixing on LOW speed until just incorporated. (Keep in mind that you don't want to add any extra air to the cheesecake, so mixing by hand or on low speed at this point is very helpful!)
Prep Pan For A Hot Water Bath. If Using A Hot Water Bath (Recommended), wrap the bottom and sides of the springform pan with foil. To fully waterproof the pan (*highly recommended*), place the springform pan into a slow cooker liner bag or an oven bag/turkey bag. Pull the oven bag up the sides of the springform pan, then gather the excess to one side and knot tightly to keep the bag secure to the sides.
Create Hot Water Bath. Carefully pour 3/4 to 1-inch of boiling water into the bottom of the roasting pan. Carefully lower the prepared & wrapped springform pan into the water so the water comes about 1-inch up the sides of the springform pan. (See notes for modified hot water bath instructions)
Build Layers. Pour filling on top of the graham cracker crust and smooth surface with a spatula. Top with an even layer of cinnamon apples (leave any extra liquid behind!), then sprinkle the brown sugar streusel on top of the apples.