Whisk together egg and milk in a bowl. Set aside.

Whisk together sugar and cornstarch in a medium pan over medium heat.

Slowly add milk and egg mixture to pan, stirring constantly.

Bring to a boil and cook for 1 minute, stirring constantly. Remove from heat.

Combine remaining ingredients in a bowl and mix well.

Gradually add pumpkin mixture to pan, whisking constantly until blended.

Return pan to low heat and cook for 3-4 minutes until heated throughout, stirring constantly.

Remove from heat, transfer to serving dishes and refrigerate to chill.

Serve with a dollop of whipped cream or whipped topping.