In a bowl, combine the wafer crumbs and butter. Press half of the crumb mixture into an 8-in. square dish coated with cooking spray. Set remaining crumb mixture aside. Sprinkle berries over crust.
In a bowl, combine sour cream and sugar; gradually stir in half-and-half until smooth. Pour over berries. Sprinkle with remaining crumb mixture. Cover and freeze for 3 hours or until firm. Let stand at room temperature for 15-20 minutes before cutting.