Line 8" square pan with foil, extending foil over edges of pan. Measure peanut butter chips into one medium bowl and chocolate chips into second medium bowl. In heavy 3-quart saucepan, combine sugar, marshmallow creme, evaporated milk and butter. Cook over medium heat, stirring constantly, until mixture boils; boil and stir 5 minutes. Remove from heat; stir in vanilla. Innediately stir 1/2 hot mixture (1 1/2 cups) into peanut butter chips until chips are completely melted; quickly pour into prepared pan. Stir remaining 1/2 hot mixture into chocolate chips until chips are completely melted. Quickly spread over top of peanut butter layer. Cool; refrigerate 1 1/2 hours or until firm. Cut into 1" squares. Store tightly covered in refrigerator. Makes about 60 pieces or about 2 pounds candy.