In medium bowl, beat egg. Beat in sweetened condensed milk and spices. In medium saucepan, sprinkle gelatin over water and let stand 1 minute. Over low heat, stir until gelatin dissolves. Add sweetened condensed milk mixture. Over low heat, cook and stir constantly until mixture thickens slightly, 5 to 10 minutes. Remove from heat. Add pumpkin. Pour into crust. Chill 4 hours or until set. Garnish as desired. Refrigerate leftovers.