Prepare and bake the pie crust, or use a pre-made crust like a graham cracker crust.
In a medium sauce pan, whisk together the sugar and cornstarch. Whisk in the non-dairy milk.
On medium heat, bring the mixture to a gentle simmer. Stir constantly once you see the mixture start to steam. Once it thickens (this should happen within seconds of starting to simmer), remove from heat.
Mix in vanilla and salt. Stir in the chocolate chips until fully melted.
Pour into crust.
Let cool for about 4 hours in the fridge, or until set.