Mama always said that you could make shortcuts all you want (as mentioned in her note below), but you have to know the right way to prepare a dish! So here's the real deal... Southern Old Fashion Banana Pudding recipe.
Combine 1/2 cup sugar, flour and salt in top of double boiler. Stir in milk. Cook over boiling water until thick. Stir constantly. Cook, uncovered 15 minutes more, stirring occasionally. Beat egg yolks. **Gradually stir into hot mixture. Return to boiler and cook 5 minutes. Stir constantly. Remove from heat. Add vanilla. Line bottom of baking dish with wafers. Top with a layer of bananas, and then pour custard to top of bananas. Continue to layer cookies, bananas and then custard. Beat egg whites stiff, gradually add remaining sugar and beat to stiff peaks. Pile on top of custard. Bake in preheated oven 5 minutes at 425 or until lightly browned.
Note: “You can use instant pudding as a short-cut, but that’s not as good as the old fashion kind…”
**I will add that if you are a beginner, I'd temper the eggs before adding to the milk mixture. If not, you might risk scrambling them and having to start over.