Fluffy Sweet Potato Custard Pie

Directions

1. Preheat oven to 350°. On a lightly floured surface, roll dough into two 1/8-in.-thick circles; transfer to two 9-in. pie plates. Trim crust to 1/2 in. beyond rim of plates; flute edges.
2. In a large bowl, beat potatoes and butter until blended. Beat in sugar, flour, vanilla and nutmeg. Add egg yolks, one at a time, beating until blended. Add milk; beat well. With clean beaters, beat egg whites until stiff peaks form. Fold into sweet potato mixture.
3. Pour into pastry shells. Bake 45-55 minutes or until a knife inserted in the center comes out clean. Cover edge loosely with foil during the last 15 minutes if needed to prevent overbrowning. Remove foil. Cool on a wire rack; serve or refrigerate within 2 hours.