Pierce sweet potatoes several times with a fork. Place sweet potatoes on a baking sheet. Bake at 375 for 1 hour and 15 min or til tender. Cool slightly. Peel and discard skins. Place the pulp in a med bowl, and mash. Add the brown sugar and the next 8 ingredients to the pulp. Beat with a mixer at medium speed until well blended.
Fit pie dough into a 9" pie plate; fold edges under, and flute. Pour sweet potato mixture into pie shell. Bake at 375 for 55 min or til knife inserted in center comes out clean. Cool completely on a wire rack.