2In a 2-qt. microwave-safe glass bowl, combine sugar and corn syrup. Microwave, uncovered, on high for 4 minutes; stir. Add peanut mixture; stir until blended. Heat on high 4-5 minutes longer or until mixture becomes a light amber color ( mixture will be VERY hot). Stir in in butter. microwave 45 seconds longer. Quickly stir in baking soda and vanilla until mixture foams and becomes light-colored. Immediately pour mixture into prepared pan and spread as thin as possible with prepared spatula. Cool and break into pieces.