Mixing the crust: Preheat oven to 350 degrees F. Mix the crust ingredients in a mixer bowl until well combined. Press in a 9-inch cheesecake pan. Bake crust for 12 minutes. Cool. Wrap a double layer of aluminun foil around the cheesecake pan.
Mixing the filling: In a mixed bowl, beat cream cheese until creamy. Add flavoring, Sweet Mix, Stevia, cinnamon, and oat flour. MIx well. Add eggs, one at a time, mixing well between each addition. Fold in heavy whipping cream. Spoon evenly over baked crust. Slice the apple halves in 1/8 inch slices. Lay carefully over the cheesecake filling. Mix the crumb ingredients together. Sprinkle crumbs evenly over the apple layer.
Baking: Bake 325 degrees F for 60 minutes. Turn the oven off and crack the oven door open with a wooden spoonto allow the cheesecake to cool for 1 hour before removing from the oven.
*Cooling a cheesecake down slowly helps prevent cracks in the top. Place in the fridge for 12 hours to firm before serving.