1 cup frozen reduced-calorie whipped topping, thawed
Preheat oven to 325°.
Combine the first 3 ingredients in a medium bowl; toss with fork until moist. Press into bottom and up sides of a 9-inch pie plate coated with cooking spray. Bake at 325° for 10 minutes; let cool.
Combine 2/3 cup sugar and cornstarch in a medium saucepan. Gradually add milk, stirring with a whisk. Bring to a boil over medium heat; cook 1 minute, stirring constantly. Gradually add hot milk mixture to eggs and egg yolk, stirring constantly with a whisk. Return milk mixture to pan; cook over medium heat until thick (about 4 minutes), stirring constantly. Remove from heat; stir in vanilla and food coloring.
Arrange 1 1/4 cups banana in bottom of prepared pie crust; pour half of custard over banana. Top with remaining banana and custard. Cover the surface of custard with plastic wrap; chill 4 hours. Remove plastic wrap; and spread whipped topping over pie.