Make pie dough.* Refrigerate at least 1 hour before using.

Roll out the dough on a floured surface to 13 inch round. Line a greased 9 inch baking pan with the dough.

Cover with plastic wrap, and cill in refrigerator at least 30 min.

Cook sweet potatoes, peel and mush them. Preheat oven to 425F.

In a large bowl, combine sweet potatoes, butter, and eggs, beat them until smooth.

Add remaining ingredients and mix until smooth.

Pour filling into prepared pie crust. Transfer to oven, bake 15 min.

Then reduce the heat to 375F and bake until set, 30 - 40 min.

Let the pie cool on a wire rack and serve with whipped cream.