Prepare the sweet potatoes by washing, peeling, cutting into chunks, boiling for 15-20 minutes, and mashing until smooth.
If making your own pie crust, combine flour, salt, and butter, then add cold water to form a dough. Roll out and fit into a pie dish.
Mix the mashed sweet potatoes with sugars, evaporated milk, melted butter, eggs, vanilla, cinnamon, nutmeg, and salt until smooth.
Pour the filling into the prepared pie crust and spread evenly.
Preheat oven to 350°F. Bake the pie for 45-50 minutes until set. Cool for at least 1 hour before serving.