In medium saucepan over medium heat, heat milk until bubbles form at edges. In a bowl, combine sugar, cornstarch and salt. Pour into hot milk, a little at a time, stirring to dissolve. Continue to cook and stir until mixture thickens enough to coat the back of a metal spoon. Do not boil. Remove from heat, stir in vanilla and butter. Chill before serving.

In a mixer, combine the whipping cream and powdered sugar. Whip until soft peaks form. Transfer to a bowl and set aside.

Slice the bananas in thin ½ inch slices and set aside. Start with a layer of pudding, followed by a layer of nilla wafers, and then some chantilly cream, some bananas, more pudding, another layer of nilla wafers, the last bit of bananas and then finish it off with the rest of the chantilly cream. Chill for at least 4 hours before serving.