1Heat oven to 350ºF. Grease 9-inch glass pie plate with shortening or spray with cooking spray. In small bowl, mix bananas and lemon juice; set aside.
2In medium bowl, stir remaining ingredients except whipped topping, walnuts and caramel topping until blended. Add banana mixture; stir until blended. Pour into pie plate.
3Bake 40 to 45 minutes or until golden brown and knife inserted in center comes out clean. Cool completely, about 1 hour. Cover and refrigerate about 2 hours or until chilled.
4Spread pie with whipped topping; sprinkle with walnuts. Drizzle with caramel topping before serving. Store covered in refrigerator.