Preheat the oven to 425°F with a rack in the center.
In a large bowl, whisk together the eggs then whisk in the sugar, pumpkin purée, pumpkin pie spice and 1/2 teaspoon kosher salt. Gradually whisk in evaporated milk.
Pour the pumpkin mixture into the unbaked pie shell.
Bake the pie for 15 minutes, then reduce the oven temperature to 350°F and continue baking until the center is set and a toothpick inserted into the center comes out clean, about 40 minutes.
Remove the pie from the oven and let it cool on a rack for a minimum of 2 hours. (If not serving, store in the refrigerator tented with foil.)
When ready to serve, cut the pie into slices and top with whipped cream.