Preheat your oven to 350°F and place the unbaked crust in a 9-inch pie dish. Let it come to room temperature while you prepare other ingredients, preventing shrinkage during baking.
Roast your 2 pounds of sweet potatoes until fork-tender, about 50 minutes at 400°F. Scoop the flesh into a food processor and blend until silky smooth with zero lumps remaining.
Cream together 1/2 cup softened butter with both sugars until fluffy and light-colored, about 2 minutes. This step aerates the filling and ensures proper texture throughout your thanksgiving sweet potato pie crowd showstopper.
Add eggs one at a time, beating well after each addition, then mix in vanilla extract. Pour in evaporated milk slowly while blending on low speed to maintain smooth consistency.
Fold the sweet potato puree into the wet mixture using a spatula until just combined. Add cinnamon, nutmeg, ginger, cloves, salt, and cornstarch, stirring until no spice streaks remain visible.
Pour filling into the pie crust and bake for 50 minutes until a knife inserted 2 inches from the edge comes out clean. The center should jiggle slightly—this residual heat will set it to perfect consistency.
Cool on a wire rack for 2 hours before slicing, allowing the filling to fully set. Serve at room temperature or chilled with whipped cream for maximum texture contrast.