Step 1

In a cup, mix gelatin and boiling water together, and stir until gelatin is dissolved. Set aside.

Step 2

In a separate bowl, lightly beat egg yolks and milk together. Pour in a saucepan, and add sugar and flour, and whisk thoroughly until sugar and flour dissolve. Cook over medium heat, stirring constantly, for 10 minutes, until mixture thickens and comes to a boil. Stir in vanilla and gelatin.

Step 3

Arrange banana slices on graham cracker crust and pour pudding over top. Cover and refrigerate until pudding has set, about 3 hours.

Step 4

Tip: Arrange extra banana slices on top of the pie just before serving to avoid bananas browning.