Preheat the oven to 325 degrees. Line a 9 inch springform pan with parchment paper or tin foil and set aside.
Grind your nut of choice. I found using a coffee bean grinder was perfect for grinding the nuts for a perfect crust. If you have a food processor, you can use that too.
Measure out 2 ½ cups and place it into a mixing bowl. Add the melted butter and mix together until combined.
Transfer the nut crust to the lined springform pan and use the back of the spoon to spread around the edges. Refrigerate the crust while you are preparing the filling.
Mix cream cheese, sour cream, and sugar substitute and well blended.
Add the eggs, then vanilla extract, and blend.
Remove the pie crust from the refrigerator and add the cheesecake filling.
Place the cheesecake in the oven and bake for an hour, until the middle is mostly set.
Turn off the oven and open the door slightly. Allow the cheesecake to cool completely. Once cooled, refrigerate for a few hours.