Beat Egg yolks and 1/2 cup sugar until thick, add pumpkin, milk, salt, and spices: Cook in double boiler until thick.
Soften gelatin in cold water; stir into hot mixture. Beat egg whites with 1/2 cup sugar until peaks form; add to pumpkin mixture folding in gently until completely combined.
Pour into cooled baked shell and chill.
If desired spread sweetened whipped cream over top of pie.
Not a NESTLÉ®-tested recipe.