Peel and cube the sweet potatoes into 2 inch pieces. In a large saucepan cover sweet potatoes with water. Boil the potatoes until they are fork tender. Drain potatoes in a colander and allow to cool.
Add cooled potatoes to a large mixing bowl. With a handheld or stand mixer, mix potatoes on medium speed for about 3 minutes. Lift mixer to spin off potatoes, turn off mixer and wash strings off the beaters. Repeat about 6 times or until the potato mixture is stringless.
Add remaining ingredients mix on high speed until thoroughly blended and smooth. Pour sweet potato mixture into unbaked pie shell.
Bake 50 minutes or until center is slightly jiggly or until a toothpick inserted in the center comes out clean. If while baking edges if pie crust brown too quickly, apply pie crust shield or cover with aluminum foil.