Make the Graham Cracker Crust
Preheat oven to 350°F.
Mix crumbs, sugar, salt, and melted butter until it resembles wet sand.
Press into 9-inch pie dish.
Bake 8–10 minutes. Cool completely.
Or Make Traditional Pie Crust
Mix flour and salt. Cut in cold butter.
Add ice water until dough forms. Chill 30 minutes.
Roll out, fit into pie dish, blind bake at 375°F for 15 minutes with weights, then 5–7 minutes without. Cool.
Make the Custard Filling
Whisk yolks with cornstarch.
Heat milk, sugar, and salt until simmering.
Temper yolks with hot milk, return to saucepan, stir until thick.
Stir in butter and vanilla. Strain if needed.
Cool with plastic wrap touching surface.
Assemble the Pie
Slice bananas into cooled crust.
Pour cooled custard over bananas. Cover and chill 4 hours.
Whip the Cream
Chill bowl and beaters.
Beat cream, powdered sugar, and vanilla to stiff peaks.
Decorate and Serve
Top with whipped cream and optional decorations.
Chill 30 minutes before serving. Enjoy within 2 days.