Preheat oven to 375°.
Pierce sweet potatoes several times with a fork. Place sweet potatoes on a baking sheet. Bake at 375° for 1 hour and 15 minutes or until tender. Cool slightly. Peel and discard skins. Place the pulp in a medium bowl, and mash. Add 3/4 cup brown sugar and the next 8 ingredients (through eggs) to pulp. Beat with a mixer at medium speed until well blended.
Fit refrigerated pie dough into a 9-inch pie plate; fold edges under, and flute. Pour sweet potato mixture into pie shell. Bake at 375° for 55 minutes or until a knife inserted in center comes out clean. Cool pie completely on a wire rack.