In large saucepan,combine gelatin,cornstarch,spice and salt.Stir in pumpkin and milk. Let stand 5 minutes to soften gelatin.
Cook and stir over medium heat until mixture bubbles:cook and stir 2 minutes more. Remove from heat.Gradually stir 1 cup hot mixture into beaten eggs;return all egg mixture to saucepan. Cook and stir over low heat for 2 minutes.Do not boil. Remove from heat.Stir in sweetener.
Put 1 gingersnap in each 6oz custard cup,spoon in custard,cover and chill 6-24 hrs. Garnish with whipped topping before serving if you desire.Sprinkle with nutmeg.