Step 1

Preparation Whisk 1/2 cup plus 2 tablespoons sugar, cornstarch, and 1/4 teaspoon salt in medium saucepan to blend. Add 1/2 cup milk and egg yolks; whisk until smooth. Whisk in remaining 2 cups milk. Bring mixture to boil over medium-high heat, whisking constantly. Boil 1 minute, whisking constantly. Remove pan from heat; add chocolate chips and butter. Whisk pudding until melted and smooth. Stir in vanilla.

Step 2

Divide pudding evenly among 6 dessert cups or wineglasses. Place plastic wrap directly onto surface of each, covering pudding completely. Chill until cold, at least 3 hours. DO AHEAD: can be made up to 1 day ahead. Keep chilled.

Step 3

Using electric mixer, beat whipping cream, Grand Marnier, orange peel, and remaining 1 tablespoon sugar in medium bowl until peaks form. DO AHEAD: Can be made 2 hours ahead. Cover and chill.

Step 4

Uncover puddings. Spoon dollop of whipped cream over each and serve.