1. Stir together milk chocolate chips, peanut butter chips, whipping cream and corn syrup in medium microwave-safe bowl. Microwave at MEDIUM (50%) 1 to 1-1/2 minutes or until chips are melted and mixture is smooth when stirred. If necessary, microwave an additional 30 seconds at a time, stirring after each heating, just until mixture is smooth when stirred. Stir in vanilla. Serve warm over ice cream. About 2 cups sauce.