Prepare pie crust; let cool.

To make filling: In a food processor combine sugar, flour, salt, 1 cup milk, egg yolks and banana flavoring. Process all ingredients until sugar has dissolved. Pour banana cream mixture into a medium sized sauce pan. Add remaining 1 cup of milk to mixture. Heat cream over medium-high heat, letting mixture boil for one minute. Remove from heat and stir in butter and vanilla. Pour into cooled pie shell. Refrigerate 2 hours.

To serve: Cut a piece of pie and top with whipped cream and banana slices.