Add sweet potatoes to a large pot and cover with 1 inch of water. Bring to a boil and cook for about 45 minutes or until the potatoes are cooked through and soft.
Run the potatoes under cold water remove the skin from the potatoes.
Preheat oven to 350 degrees and arrange a pie crust in a 9-inch pie plate.
Add the hot potatoes and butter to a mixing bowl and beat with a mixer until smooth and creamy.
Beat in the sugars, evaporated milk, eggs, flour, nutmeg, cinnamon, ginger, and vanilla on medium speed until mixture is smooth.
Pour filling into the prepared pie crust.
Bake for 55 to 60 minutes, or until knife inserted in center comes out clean. Pie will puff up like a soufflé and then will sink back down as it cools.
Cool on the counter for one hour and then transfer to the refrigerator for at least 4 hours before serving. Serve with whipped cream, if desired.
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Notes
Fresh or Canned Sweet Potatoes: This recipe does taste best with fresh sweet potatoes, but when you're in a rush, canned work just as well. Drain the liquid from the can and place the potatoes in a mixing bowl. Microwave for 2-3 minutes or until the potatoes are warm enough to easily mash. Proceed with step 3. Spices: Feel free to increase the amount of cinnamon, nutmeg, and ginger based on your tastes. As is, this is a mildly spiced pie. You may also sub these three spices for 1 to 1 1/2 teaspoons of pumpkin pie spice. Pie Crust: You may use homemade or store bought pie crust for this recipe.