1. Spray the bottom and sides of a 13 x 9-inch pan with cooking spray. In 2-quart saucepan, heat sugar and corn syrup to boiling over medium-high heat, stirring constantly. Remove from heat, then stir in peanut butter until melted.
2. In an extra-large bowl, stir the cereal and peanut butter mixture with a wooden spoon until the cereal is evenly coated. Stir in 1 cup of the candies.
3. Press cereal mixture in pan, then immediately sprinkle with remaining 1/2 cup candies; press in lightly with fingers. Let stand about 30 minutes until cool. For bars, cut into 6 rows by 6 rows.
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