I love these, they're good, easy and marshmallow free.
PEANUT BUTTER RICE KRISPY TREATS
1 c. granulated sugar
1 c. white Karo syrup
1 c. smooth peanut butter
5-6 c. Rice Krispies
Heat sugar and Karo until hot. Add peanut butter and boil 1 minute. Remove from stove and add Rice Krispies. Mix well and spread into a well greased 9x13 inch pan. Cool and cut into bars.
If you want, you can put chocolate chips on top when they are still warm and spread it over for a chocolate frosting.