In a large microwave safe bowl, combine the butterscotch chips, peanut butter and butter.
Cook in the microwave at medium power for 2 minutes, stir and continue to cook in 30 seconds increments until melted.
Add vanilla extract, stir until smooth.
Fold the cereal into the mixture until combined.
Put the marshmallows in a microwave safe bowl and cook in the microwave for 1 minute, on high, then stir until smooth.
Fold the melted marshmallow into the cereal mixture until combined.
Press the mixture into the prepared pan (9 x 13 pan), using your fingers or the bottom of a measuring cup to flatten the mixture.
n microwave safe bowl, combine the chocolate chips and vegetable oil. Cook on high, in the microwave in 30 second increments, until shiny, stir until smooth.
Spread the chocolate evenly over the cereal mixture and sprinkle with the chopped peanuts.
Chill until firm, then cut into bars.