Preheat oven to 350 degrees F.
Combine flour and sugar in a mixing bowl. Add the eggs and butter; mix to combine. Stir in the bourbon, walnuts, chocolate chips, vanilla, and salt. Pour the mixture into the unbaked piecrust. Bake for 40 to 45 minutes. Let cool before slicing.
* Note: If you ever include a similar recipe in a cookbook, you can't legally call it a "Derby Pie" recipe. The name "Derby Pie" is trademarked, and the owners of the name are very aggressive protecting the name "Derby Pie."