Combine 1 cup peanut butter, karo syrup and sugar and bring to a boil. Remove from heat and pour in rice krispie cereal. Mix together and put into 9 x 13 pan. Do not smash too much, or it will be too solid and difficult to eat and cut through.
Mix together 1 cup peanut butter and 1 cup chocolate chips. Melt in microwave, 30 seconds at a time, mixing after each interval until melted. Pour over rice krispie treats. Put into fridge and let set for 2 hours. Then ready to serve.