STEP ONEPREPARE recipe for Single-Crust Pie Crust to make a Single-Crust Baked Pie Shell. Cool on wire rack.
STEP TWOCOMBINE sugar, cornstarch and salt in 2-quart saucepan. Whisk in milk. Cook over medium heat, whisking constantly, until mixture comes to a boil. Remove from heat.
STEP THREEWHISK egg yolks in medium bowl until blended. Gradually whisk in about 1/2 cup hot mixture to temper the eggs. Slowly pour egg yolk mixture into hot mixture, stirring rapidly to prevent lumping. Bring to a boil over medium heat, stirring constantly. Remove from heat. Stir in shortening and vanilla until shortening is melted. Cool to lukewarm.
STEP FOURSPREAD about 1/3 of pudding mixture in pie shell. Arrange banana slices over pudding. Top with remaining pudding mixture, spreading evenly. Cover and chill 2 hours. Top with whipped topping just before serving. Garnish with additional banana slices, if desired.