Butter 20 cm pie plate. In medium microwave-safe bowl, place syrup and chocolate chips. Microwave at HIGH (100%) 45 seconds or until hot; stir until smooth.
Remove quarter cup chocolate mixture to small bowl. Add cereal to remaining chocolate mixture, stirring until well coated; cool slightly.
Using back of spoon, press mixture evenly on bottom and up sides of prepared pie plate to form crust. Place in freezer 15 o 20 minutes or until crust is firm.
Meanwhile, stir sour crem into reserved chocolate mixture. Spoon half of ice cream into crust; spoon portion of chocolate sause over layer. Top with scoops of ice cream and remaining suace. Cover; return to freezer until serving time. 6 servings.