In a saucepan mix together the margarine, white sugar, peanut butter and corn syrup. Heat to boiling and boil for 1 minute.
Remove from the heat and add the Rice Krispies.
Mix and pat into an 8" square buttered dish. Top with chocolate chips while still warm and smear the chips as they melt, to cover the squares. (Sometimes I will use a hairdryer to speed along the melting process).
Score these squares with a knife while they are still warm, but do not cut until they are set. ENJOY!