Peanut Butter Toffee Triangles

Line an 8-by-8-inch pan with aluminum foil; spray with vegetable cooking spray. 

Combine cereal, marshmallows and toffee bits in large bowl; set aside. 

Microwave sugar, corn syrup and butter in medium microwave-safe bowl on HIGH 2 1/2 to 3 minutes* or until mixture comes to a rolling boil. (Or bring sugar, corn syrup and margarine to a rolling boil in small saucepan, stirring constantly. Remove from heat). Stir in peanut butter until smooth. 

Pour over cereal mixture. Stir quickly with rubber scraper until all pieces are evenly coated. Pour into prepared pan; press down firmly with scraper. 

Chill 1 hour. Lift from pan using foil; remove foil. Cut into 16 squares; cut each square in half diagonally to form a triangle. Store in airtight container.