Bake pie crust according to package directions and let cool
In a medium sauce pan add the sugar, cornstarch, salt and whisk together. Heat on medium low heat and whisk in the half and half and the egg yolks until smooth. Bring the mixture to a low simmer, continue whisking until it thickens to the texture of a custard about 5-6 minutes.
Remove from heat and whisk in vanilla and butter. Let the mixture cool for a 10 minutes.
Poor 1/4 of the filling into the pie shell. Add one sliced banana and then another layer of pie filling followed by another banana and then the rest of the pie filling.
Cover with saran wrap and chill 4 hours
Using a stand mixer with the whisk attachment or electric mixer whip the cream, powdered sugar and vanilla on highest speed until soft peaks form. Refrigerate until ready to use.
Spread the whipped cream over the top of the pie and sprinkle with sliced almonds.
The pie is best served the same day
Notes
**You can substitute 2 cups of store bought whipped cream