Bake sweet potatoes and let them cool before scooping out the filling. The quickest way to bake these is to wash and dry the potatoes. Poke each several times with a fork. Place both potatoes on a microwave-safe plate and cook in the microwave for 5 minutes. Flip potatoes and cook for another 3 to 5 minutes until potatoes are tender. Set aside and let cool, then scoop potatoes out of the skin (don’t include potato skin in pie) and mash well.
Preheat the oven to 350°F.
In a large mixing bowl, beat together mashed sweet potatoes, butter, sugar, brown sugar, evaporated milk, eggs, pumpkin pie spice, cinnamon, vanilla, and salt. Beat just until mixed.
Pour pie filling into the unbaked pie crust.
Place pie on a baking sheet (just in case there’s a spill) and bake for 50 to 55 minutes (until the middle no longer jiggles).
Let the pie cool completely before topping it with whipped topping.
Serve topped with Cool Whip.