1Butter square pan, 8x8x2 inches. Heat brown sugar and corn syrup just to boiling in 3-quart saucepan over medium heat, stirring frequently. Remove from heat; stir in peanut butter and cinnamon until smooth.
2Stir in cereal and peanuts or almonds until evenly coated. Press firmly in pan. Let stand about 1 hour or until set. Cut into 4 rows by 3 rows. Store loosely covered at room temperature.