Heat oven to 425°F. Prepare recipe for single crust pie. Roll out and place in 9-inch pie plate. Press to fit without stretching dough. Flute edges. Thoroughly prick bottom and sides with fork to prevent shrinking. Bake 18 to 20 minutes or until lightly browned. Cool. Combine sugar, flour and salt in 2-quart saucepan. Blend in milk. Stir over medium heat until mixture thickens. Remove from heat. Blend small amount of hot mixture into egg yolks. Blend back into hot mixture. Stir over medium heat until boiling. Boil 1 minute, stirring constantly. Remove from heat. Blend in shortening and vanilla. Cool to lukewarm. Arrange sliced bananas on bottom and up sides of pie crust. Pour filling over bananas, spreading evenly. Chill 2 hours or until completely cool. Top with whipped cream and additional banana slices, if desired.