Step 1

Bake the pie shell according to package directions; cool.

Step 2

In a 2-qt. saucepan stir together sugar, cornstarch and salt.

Step 3

In a container with a pouring spout, combine egg yolks and milk.

Step 4

Gradually blend milk mixture into sugar mixture.

Step 5

Cook over medium heat, stirring constantly, until mixture comes to a boil. Boil and stir for 1 minute; remove from heat. Stir in butter and vanilla. Add 1-3/4 cup chocolate chips and stir until chips are melted and mixture is well blended.

Step 6

Pour into prepared pie shell. Press plastic wrap onto filling. Cool. Refrigerate several hours or until well chilled and firm.

Step 7

Garnish with whipped cream and remaining chocolate chips.