Cook corn syrup and sugar together in a large pan over medium heat, stirring to dissolve sugar. Bring mixture to a boil. Remove from heat. Stir in peanut butter; mix well. Add cereal; stir until evenly coated.
Pour into greased 15 x 10-inch pan and pat into place.
Melt chocolate and butterscotch chips together in saucepan over low heat, stirring constantly. Spread over cereal.
Cool at least 45 minutes, or until firm. Cut into bars or fun shapes for Halloween. If desired, pipe frosting to form Halloween shapes or words.
Decorating Ideas: Pumpkins: Cut circles using a 2 to 3-inch biscuit cutter. Pipe on orange frosting for the body and attach candies with a dab of melted white chocolate or use black frosting gel to make eyes, nose and mouth. Mummies: Cut into bars or circles. Drizzle or pipe white frosting back and forth horizontally and finish with two candy eyes. Tombstones: Cut into bars, cutting off upper corners diagonally. Pipe frosting to make shapes or words on each “tombstone.” TIP: Tombstones will easily stand upright if the bottom of each is coated with frosting. Spiders: Cut into bars, use black liquorish to form the body and legs. Pipe colored frosting to add more details to the body and finish off with two candy eyes.