Boil 1 cup sugar and 1 cup Karo syrup. Bring to boil and remove from heat. Blend in 1 cup peanut butter and 6 cups Rice Krispies. Press in buttered 13 x 9 pan. Melt 1 (6 ounce) package chocolate chips and 1 (6 ounce) package butterscotch chips and spread on top.

Chill 5 minutes.