Preheat oven to 400° F.
In a small bowl, combine the sugar, cornstarch, salt and cinnamon.
In a large bowl, combine the eggs, pumpkin and sugar mixture. Gradually stir in milk.
Combine both mixtures and pour into pastry shell.
Bake at 400° F for 10 minutes. Reduce heat to 350° and bake for 45-50 minutes longer or until a knife inserted near the center comes out clean.
Cool on a wire rack.