In a small bowl, whisk together sugar and spices. Set aside.
In a large bowl, whisk together pumpkin, milk, and eggs until well combined. Add sugar and mix thoroughly.
Pour the filling into a par-baked pie shell. Cover with a pie crust cover or aluminum foil to prevent the edges from burning. Remove the cover 15 minutes before the pie is finished baking.
Bake for 40-50 minutes until the center slightly jiggles and the edges are puffed up. The center of the pie should reach 175°F.