1 unbaked pastry shell (9 inches)
1/4 tsp. salt
1/2 tsp. ground nutmeg
1/2 tsp. ground cinnamon
1 tsp. vanilla extract
3/4 cup evaporated milk
2 large eggs at room temperature, lightly beaten
1/2 cup sugar
1/3 cup butter, softened
2 medium sweet potatoes (about 1-1/2 pounds), peeled and cubed