Add, margarine, peanut butter and chips to a medium sauce pan and heat until ingredients have melted together. Stir as they are melting to combine evenly.
Remove from heat and add the sweetened condensed milk. Stir until well blended. Then stir the miniature marshmallows into the mixture.
Divide the jar of roasted peanuts into thirds, and evenly spread 1/3 on bottom of of the baking pan, Stir 1/3 into the mixture above. Spread mixture on top of the peanuts in the bottom of baking pan, Carefully press mixture evenly into the pan.
Sprinkle the remaining peanuts on top. After they are evenly distributed, press them slightly into the bar mixture so they stick to the bars.
Place into the refrigerator to store. To serve cut into bars. Enjoy!