Add the prepared pie crust dough to a 9-inch pie dish. In a small bowl, beat together the egg and milk and use a pastry brush to coat the pie crust with the egg wash. Discard excess egg wash. Set pie crust aside.
Once cooked, remove from oven and allow to cool completely for about 3 to 4 hours before slicing. Once cooled serve with whipped cream. Pumpkin pie should be consumed at room temperature the day it is made or stored covered in the refrigerator for up to 4 days.