In large microwave-safe bowl, combine marshmallows, peanut butter, butter, corn syrup and vanilla. Microwave, uncovered, at 70% power 2 to 3 minutes, stirring often until blended. Stir in remaining ingredients. Spread into greased 13 x 9 x 2-inch baking pan. Bake at 350° 15 to 20 minutes or until set. Cool on wire rack. Cut into bars. makes 2 dozen.
*Note: Reduced-fat or generic brands of peanut butter are not recommended for