Make sweet potato filling: In medium bowl, with electric mixer, beat 1 egg until frothy.
Add mashed cooked sweet potatoes, sugar, butter, vanilla extract, salt, cinnamon, allspice, and nutmeg; beat at medium speed until the mixture is smooth, about 2 minutes.
Make pecan topping: In medium bowl, with mixer, beat eggs until frothy.
Add sugar, corn syrup, melted butter, vanilla and cinnamon.
Beat at low speed just until mixture is well blended, about 1 minute.
Stir in pecans.
Preheat oven to 350 degrees Fahrenheit.
To assemble: Turn sweet potato filling into unbaked pie shell, spreading evenly.
Pour pecan topping over top.
Bake 60 to 70 minutes until set, and knife inserted in center comes out clean.