Preheat your oven to 425°F (218°C). Roll out your dough on a lightly floured surface to a 1/8-inch-thick circle, and transfer it to a 9-inch pie plate. Trim the crust to 1/2 inch beyond the rim of the plate, and flute the edge. Refrigerate while preparing the filling.
Note: There’s no need to pre-bake the pie crust for this recipe! Whether you’re making your own homemade crust or reaching for a store-bought 9-inch pie crust, both work beautifully—just be sure it’s unbaked before you add your filling.
In a medium saucepan, place your peeled and cubed sweet potatoes and add enough water to cover them. Bring to a boil and cook uncovered until tender, for about 13-15 minutes. Drain the whole sweet potatoes, and return them to the pan. Mash them until very smooth and cool to room temperature.
In a mixing bowl, cream together your softened butter and sugar. Add your lightly beaten eggs and mix well. Add your evaporated milk, 2 cups (400g) of mashed sweet potatoes, vanilla, cinnamon, nutmeg, and salt. Mix everything well. Pour the mixture into your prepared crust.
Bake for 15 minutes, then reduce the heat to 350°F (177°C). Continue baking until set or until a knife inserted in the center comes out clean, which should take around 35-40 minutes. Allow your sweet potato pie to cool on a wire rack, and then refrigerate any leftovers.