Scald 1 cup milk over boiling water. Mix sugar, salt, flour and remaining milk together and stir into hot milk and cook slowly until thickened, constantly stirring.Cover and cook over boiling water for another 5 minutes.
Add mixture to to egg yolk and cook for about a minute. Add butter and vanilla, cool.
Fill pie shell with alternate layers of cream filling and sliced bananas. Top with whipped cream and serve.
Makes 1 - 8" pie. For 9" pie use 2 cups of milk and 3 egg yolks.
This is a basic cream recipe that I also use for chocolate pie (1 chocolate square melted with 2 tbsp sugar)