In a small saucepan, scald milk by heating until just before it boils.
In a medium saucepan, combine dry ingredients.
Gradually stir in hot milk to dry ingredients and cook over medium heat until thickened (2-3 minutes).
In a small bowl, slightly beat the eggs.
Temper the eggs by adding a small amount of the hot mixture to the eggs, and mix until well combined.
Then add eggs into the hot mixture and cook 1 minute longer (stirring constantly).
Remove from heat and add the vanilla and butter. Let mixture cool until lukewarm.
While cooling, make whipped cream with stand mixer or by hand, beat 8 oz heavy whipping cream until soft peaks form, then add sugar or powdered sugar to sweeten to taste.
Fill the baked pie crust with banana slices.
Next add the filling, then top with whipped cream.
Place in the fridge to set for at least 30 minutes. Enjoy!
Notes
Use ripe but firm bananas to prevent them from releasing excess moisture into the pie filling. To prevent a soggy crust, consider blind-baking the pie crust and adding a layer of chocolate ganache before filling it with the custard.For a decorative touch, garnish the pie with whipped cream and additional banana slices just before serving.