Mix the base together and press into an unbuttered pan, 9 x 13, and bake 12 to 16 minutes. Remove from oven and sprinkle 3 cups marshmallows on the base mixture and place back in the oven until marshmallows puff up.
Remove from oven and cool.
While cooling, mix the corn syrup, butter, vanilla and butterscotch chips over low heat , stirring constantly until topping is smooth. Remove from heat and add immediately the Rice Krispies and Peanuts.