The lady shapes rice krispie treats in the form of a giant numeral for her child's age. Don't use margarine - use real butter and you can also add Butterscotch chips and peanut butter to the rice krispies and no marshmallows. First, if you want them to be of the right consistency and flavor, you have to use real butter. If you want to get scientific, water that’s about 35°C will give the dough