1. Bake pie crust at 325°F for 10 minutes.
2. Whisk sugar & cornstarch in pot. Add cream & butter & whisk. Cook over medium heat till thick.
3. Strain, stir in vanilla, add to crust.
4. Sprinkle cinnamon sugar on top. Bake at 325°F for 20 minutes. Broil for 1 minute.
5. Cool completely, then refrigerate for 1 hour or till ready to serve.