2. Add your uncooked pie crust to a 9 inch dish. Crip the edges if desired.
3. Whisk together the eggs, buttermilk, lemon juice, and vanilla in a medium measuring cup. Set aside.
4. Add the sugar, cornstarch, and cinnamon to a mixing bowl. Whisk to combine.
5. Whisk the butter into the wet ingredients. Mix into the dry ingredients until smooth.
6. Pour into your prepared crust.
7. Bake for 15 minutes. Lower the cooking temperature to 325 degrees. Bake 30 to 40 additional minutes or until the filling is set.
8. Cool completely.
Notes
When filling is set it should be firm but still have a slight jiggle.Tip: Crust starting to brown? Add foil to the edges when you lower the cooking temperature after 15 minutes.