01 - Set oven temperature to 350°F.
02 - Place pie crust into a 9-inch pie pan and set aside.
03 - In a large bowl, mix mashed sweet potatoes with melted butter until smooth.
04 - Add granulated sugar, brown sugar, eggs, evaporated milk, vanilla extract, cinnamon, nutmeg, and salt to the bowl. Whisk thoroughly until mixture is creamy and uniform.
05 - Pour filling evenly into the prepared crust and smooth the surface.
06 - Bake for 50 to 55 minutes, or until the center is set and a knife inserted comes out clean.
07 - Remove from oven and let cool completely on a wire rack before slicing.